The Chicago (SSN 721) is the U.S. Navy's 34th Los Angeles-class fast attack submarine. She was christened and launched on October 13, 1984. Mrs. Vicky Ann Paisley, wife of former Assistant Secretary of the Navy Melvin R. Paisley, served as sponsor of the ship. Cmdr. Robert B. Avery is the prospective commanding officer.

July 21, 1986 The Pre-Commissioning Unit (PCU) Chicago underway for the first time to conduct Builder's (Alpha "A") sea trials. Underway for Bravo trials from July 24-25; Underway for Charlie trials from Aug. 21- Sept. 1; Underway for sea trials from Sept. 16-17.

September 27, USS Chicago was commissioned during a ceremony at Naval Station Norfolk.

From October 14- Nov. 1, the Chicago was underway for acoustic trials at the Exuma Sound range, off Bahamas. Port call to Port Everglades, Fla., from Oct. 24-27; Underway for local operations from Nov. 3-8.

From Nov. 17- Dec. 20, USS Chicago was underway for weapons systems acceptance trials in the Puerto Rican Op. Area and ASW exercises in the Guantanamo Bay OPAREA. Port call to Port Canaveral, Fla., from Dec. 10-13.

January 5, 1987 SSN 721 commenced a Post Shakedown Availability (PSA) at Newport News, Va.

March 20, Cmdr. Stanley R. Szemborski relieved Capt. Robert B. Avery as commanding officer of the USS Chicago.

March 24, 1989 USS Chicago departed its homeport of Naval Submarine Base Point Loma in San Diego, Calif., for its maiden western Pacific deployment. Port call to Pearl Harbor, Hawaii, from March 30-31.

April 19, The Los Angeles-class attack submarine arrived in Naval Base Yokosuka, Japan, for a nine-day upkeep.

June 29, USS Chicago pulled into Subic Bay, Philippines, for a nine-day port call.

July 19, The Chicago arrived in Hong Kong, British Crown Colony, for a four-day port visit.

July 30, SSN 721 pulled into Apra Harbor, Guam, for a three-week port call to get tender support services from USS Proteus (AS 19). Port call to Yokosuka from Sept. 7-8 after participating in exercise Thalay Thai in the Gulf of Thailand; Brief visit to NAS Alameda in San Francisco on Sept. 20.

September 23, USS Chicago returned to San Diego after a six-month deployment. Underway for local operations from Oct. 23-28.

November 15, Cmdr. Glenn H. Ward relieved Cmdr. Stanley R. Szemborski as 3rd CO of the Chicago.

USS Chicago was underway for Anti-Submarine Warfare (ASW) operations in the SOCAL Op. Area from Nov. 18-22 and Nov. 27-31; Conducted test launch of Tomahawk Land Attack Missiles ( TLAMs) from Dec. 4-7; Underway again for local operations from Dec. 11-15.

From Jan. 5 through Feb. 28, 1990, the Chicago was underway for Prospective Commanding Officer (PCO) operations in the Hawaiian Op. Area. Port call to Pearl Harbor from Jan. 12- Feb. 4; Port visit to Lahaina, Maui, from Feb. 17-20; Underway for CNO special project from March 7-14; Underway for routine training from March 20-25; Inport Naval Air Station Alameda from March 26-31; Returned home on April 11 after participating in PACSECEX 2-90 in the Puget Sound OPAREA; Underway for local operations from May 14-25 and May 29- June 8.

June 22, USS Chicago pulled into Esquimalt naval base for a two-day visit to Victoria, Canada, after conducting testing at the Nanoose test range off British Columbia. Returned home on June 29; Underway for Independent Steaming Exercises (ISE) from Aug. 15-19; Underway for Pre-Overseas Movement Certifications (POMCERT) from Sept. 10-13; Underway for Dependent's Day Cruise on Sept. 14.

September 25, USS Chicago departed NSB Point Loma for a scheduled western Pacific deployment. Port visit to Hong Kong from Oct. 30- Nov. 4.

November 13, SSN 721 pulled into Yokosuka, Japan, for a five-day upkeep. Brief visit to Naval Base Yokosuka again on Jan. 4.

January 9, 1991 The Chicago pulled into Apra Harbor, Guam, for a 17-day port call to get tender support services from USS Proteus (AS 19). Entered the Red Sea on Feb. 3 in support of Operation Desert Storm.

March 13, USS Chicago arrived in HMAS Stirling at Garden Island, Australia, for a five-day visit to Perth.

April 2, USS Chicago returned to homeport after more than a six-month deployment in the U.S. 5th and 7th Fleet Areas of Responsibility (AoR). Underway for local operations from May 3-5, June 6-20 and 25-28th.

July 15, The nuclear-powered submarine commenced a nine-week Drydocking Selected Restricted Availability (DSRA). Underway for sea trials from Sept. 12-13; Underway for local operations from Sept. 23-25; Underway for two Dependent's Cruises on Sept. 26 and VIP cruise on 27th; Underway again from Oct. 1-20.

October 12, The Chicago arrived in San Francisco, Calif., for a six-day port visit to participate in Fleet Week celebration. Underway for local operations from Oct. 29- Nov. 1; Underway for sea trials from Nov. 25-27; Underway for local operations from Dec. 2-5, Feb. 10-21, Feb. 24-28, March 3-8, March 10-12 and March 30- April 3.

April 18, 1992 USS Chicago departed San Diego for a western Pacific deployment.

May 6, SSN 721 arrived in Brisbane, Australia, for a four-day port visit to commemorate the 50th Anniversary of the Battle of Coral Sea. Port call to Townsville from May 13-18.

May 29, The Chicago arrived in Yokosuka Naval Base for a three-day port call before participating in ASWEX 92-1 from June 6-10; Brief stop at Sasebo on June 13.

June 19, USS Chicago pulled again into Sasebo Naval Base for a four-day visit to Japan before participating in ASWEX 92-2. Port call to Chinhae, ROK, from June 28- July 2.

July 7, The Chicago pulled into Apra Harbor, Guam, for an 18-day port call to get tender support services from USS Holland (AS 32). Upkeep at Yokosuka from Sept. 1-14; Another port call to Guam from Sept. 26-28.

October 5, The Los Angeles-class attack submarine pulled into Pearl Harbor for a five-day port visit.

October 16, USS Chicago returned to NSB Point Loma after a five-month deployment. Underway for two VIP cruises on Nov. 6.

November 9, Cmdr. Stephen E. Johnson relieved Cmdr. Glenn H. Ward as CO of the SSN 721.

November 16, The Chicago departed homeport to participate in COMTUEX 93-2T off the coast of southern California. Port call to NSB Bangor, Wash., from Nov. 22-23.

November 23, USS Chicago moored at newly built Ranch Point Pier in Nannose, B.C., for an overnight stop. Port call to Esquimalt, Canada, from Nov. 26-30; Returned home on Dec. 3.

January 21, 1994 USS Chicago departed Apra Harbor, Guam, after an extended upkeep period. Upkeep at Yokosuka, Japan, from Feb. 7-17; Brief stop at White Beach, Okinawa, from March 17-18; Port call to Pearl Harbor, Hawaii, from May 3-6.

May 12, USS Chicago returned to San Diego after a six-month western Pacific deployment.

September 1, SSN 721 entered the dry-dock for a three-month Selected Restricted Availability (SRA). Underway for sea trials from Jan. 24-25 and 27-29th.

February 14, 1995 The Chicago departed homeport to participate in FLEETEX with the USS Abraham Lincoln (CVN 72) BG, off the coast of southern California.

From March 6-21, USS Chicago was underway for acoustic trials at the Southeast Alaska Acoustic Measurement Facility (SEAFAC) in Behm Canal off Ketchikan, Alaska; underway again on March 27; In floating dry-dock USS Competente (AFDM 6) at Pearl Harbor from April 7-20; Returned home on May 2; Underway for Dependent's cruise from May 4-6.

May 7, Cmdr. David M. Schubert relieved Cmdr. Stephen E. Johnson as commanding officer of the Chicago.

August 1, USS Chicago departed Naval Submarine Base Point Loma for a scheduled deployment. Port call to Yokosuka from Aug. 15-19.

September 8, The Chicago arrived in Manama, Bahrain, for a four-day port visit. Inport Manama again from Oct. 5-12.

November 2, The Los Angeles-class attack submarine pulled into Naval Base Yokosuka for a three-day port visit. Upkeep at Yokosuka from Nov. 21- Dec. 3 after participating in ANNUALEX 07G.

December 14, SSN 721 pulled into Apra Harbor, Guam, for a three-week port call to get tender support services from USS Holland after participating in SPECWAREX.

February 1, 1996 USS Chicago returned to San Diego after a six-month deployment in the U.S. 5th and 7th Fleet AoR.

From October 18- Nov. 8, the Chicago wss underway for COMPTUEX 97-1A. Underway for COMPTUEX 97-1B from Nov. 14-28; Underway for local operations and Tactical Readiness Evaluation (TRE) from Dec. 9-20; Underway for local operations and ORSE from Jan. 6-16, 1997.

From Jan. 21 through March 6, USS Chicago was underway for PCO operations in the Hawaiian Op. Area. Port calls to Pearl Harbor from Jan. 26-30, Feb. 7-9 and 14-21st; Inport NAS Alameda, Calif., from Feb. 28- March 4; Underway for sea trials and Dependent's Cruise from April 21-24; Underway for testing in the Nanoose range off British Columbia on May 27; Port call to Esquimalt, Canada, from June 9-13.

June 20, USS Chicago arrived in its new homeport of Naval Station Pearl Harbor, Hawaii.

July 8, Cmdr. John C. Mickey relieved Cmdr. David M. Schubert as the 6th CO of SSN 721.

From Sept. 22- Nov. 6, the Chicago was underway for local operations and to participate in a joint U.S.-Canadian exercise MARCOT 2-98; Port visits to San Francisco (Oct. 11-15) and Esquimalt (Oct. 16-19).

January 9, 1998 USS Chicago departed Pearl Harbor for a western Pacific deployment.

January 21, The nuclear-powered submarine arrived in Naval Base Sasebo, Japan, for a two-day port call. Inport Chinhae, ROK, from Feb. 7-9 and 15-18th.

February 24, The Chicago arrived in Yokosuka Naval Base for a nine-day upkeep. Port call to Apra Harbor, Guam, from March 9-15 before participating in CONEX.

March 30, USS Chicago returned to homeport after an 80-day underway period.

May 14, USS Chicago entered the Dry Dock #3 at Pearl Harbor Naval Shipyard for a 22-month Depot Modernization Period (DMP). Departed dry-dock on March 5, 1999.

November 25, SSN 721 returned to Naval Station Pearl Harbor after a three-day sea trials.

December 8, Cmdr. Daniel E. Prince relieved Cmdr. John C. Mickey as CO of the Chicago; Underway again for sea trials from Jan. 8-13 and Feb. 9-12, 2000.

February 27, USS Chicago arrived in Naval Submarine Base Bangor, Wash., for a brief upkeep before acoustic trials at SEAFAC range. Returned to Pearl Harbor on March 16; Underway for CODT and ORSE from April 28- May 17; Underway for ASWEX from May 26-30; Underway for PCO operations from July 23- Aug. 4.

August 18, The Chicago departed Pearl Harbor for a Friends and Family Day Cruise; Underway for CODT from Aug. 21-23, Sept. 11-13 and 18-22nd; Underway for UK ASWEX from Oct. 2-7; Underway for local operations from Nov. 16-22; Underway for CODT and ORSE from Nov. 28- Dec. 6; Underway for routine training from Dec. 11-15.

March 6, 2001 USS Chicago departed homeport for a scheduled western Pacific deployment.

March 15, The Chicago arrived in Saipan, Northern Mariana Islands, for a five-day of liberty. Upkeep at Yokosuka, Japan, from March 23-30; Another port call at Naval Base Yokosuka from April 15-19; Brief visit to Naval Base Sasebo from May 11-12.

May 18, The Los Angeles-class fast attack submarine pulled into Changi Naval Base, Singapore, for a six-day port visit.

May 31, USS Chicago pulled into Apra Harbor, Guam, for a week-long port call to get tender suppport services from USS Frank Cable (AS 40).

July 16, SSN 721 arrived at White Beach Naval Facility, Okinawa, Japan, for a brief port call; Participated in CARAT Malaysia from July 23-25.

August 2, The Chicago arrived in HMAS Stirling for a six-day port visit to Perth, Australia.

August 23, USS Chicago returned to Pearl Harbor after five-and-a-half month deployment.

October 11, The Chicago entered the dry-dock at Pearl Harbor Naval Shipyard for a two-month modernization availability; Departed dry-dock on Nov. 28; Underway for sea trials from Dec. 18-21.

July 22, 2002 Cmdr. Craig M. Selbrede relieved Cmdr. Daniel E. Prince as CO of USS Chicago during a change-of-command ceremony on board the sub at Naval Station Pearl Harbor.

November 15, SSN 721 is currently participating in a large bilateral maritime exercise ANNUALEX 14G, off the coast of Japan, from Nov. 11-22.

May 6, 2003 USS Chicago returned to Pearl Harbor after a six-month deployment in the U.S. 7th Fleet AoR.

June 30, 2004 Cmdr. Rich Wortman relieved Cmdr. Craig Selbrede as commanding officer of the Chicago.

February 4, 2005 The Chicago arrived in Bremerton, Washington, for a scheduled availability period conducted by the Bangor Intermediate Maintanance Facility and the Pudget Sound Naval Shipyard.

November 29, USS Chicago departed Naval Station Pearl Harbor for a western Pacific deployment in support of the Global War on Terrorism.

May 30, 2006 The Chicago returned home after steaming 30,514 nautical miles during a six-month underway period. Port calls to Hong Kong, Japan, Singapore and Guam.

July 25, USS Chicago concluded its participation in the world's largest biennial maritime exercise Rim of the Pacific (RIMPAC) 2006.

August 11, Rear Adm. Joseph Walsh relieved Rear Adm. Jeffrey Cassias as Commander, Submarine Force, U.S. Pacific Fleet (COMSUBPAC) during a change-of-command ceremony aboard the Chicago.

November 9, The Los Angeles-class attack submarine is currently participating in a Joint Task Force Exercise (JTFEX) off the coast of Southern California, with the USS John C. Stennis (CVN 74) Carrier Strike Group, in preparation for their upcoming deployment.

June 27, 2007 SSN 721 pulled into Yokosuka, Japan, for a routine port call.

January 6, 2009 USS Chicago departed Pearl Harbor for a six-month western Pacific deployment; Returned home on June 29.

August 7, Cmdr. Jeffrey L. Cima relieved Cmdr. Rick J. Stoner as CO of USS Chicago during a change-of-command ceremony held at Naval Station Pearl Harbor.

March 15, 2010 Capt. Daryl Caudle, commander of Submarine Squadron 3, fired Cmdr. Jeff Cima after he was found guilty of "drunkenness" and "conduct unbecoming an officer," in nonjudicial punishment. The squadron’s deputy commander, Capt. James Horten, assumed temporary command of the SSN 721.

July 8, Cmdr. Nicholas R. Tilbrook relieved Capt. James Horten as CO of the Chicago during a change-of-command ceremony aboard USS Missouri Museum at Joint Base Pearl Harbor-Hickam.

October 27, Pearl Harbor Naval Shipyard successfully undocked USS Chicago from its scheduled Engineered Overhaul (EOH), six weeks ahead of schedule.

April 19, 2012 USS Chicago arrived at its new homeport of Naval Base Guam, replacing the USS Houston (SSN 703).

June 27, SSN 721 pulled into Fleet Activities Yokosuka, Japan, for a nine-day port call. The Los Angeles-class attack submarine recently departed Apra Harbor for a western Pacific deployment.

April 25, 2013 USS Chicago returned to Guam after a seven-week underway period.

August 21, The Chicago moored at HMAS Stirling at Garden Island, Australia, for a port visit to Perth.

September 20, USS Chicago returned to Apra Harbor after an 11-week western Pacific patrol.

September 27, Cmdr. Lance E. Thompson relieved Cmdr. Nicholas R. Tilbrook as CO of the USS Chicago during a change-of-command ceremony on board the sub.

May 9, 2014 USS Chicago moored outboard the USS Emory S. Land (AS 39) in Subic Bay, Republic of the Philippines, for a Fleet Maintenance Availability (FMAV).

July 1?, USS Chicago returned to homeport after a three-month western Pacific patrol.

March 22, 2015 SSN 721 moored at Changi Naval Base in Singapore for a liberty port visit.

April ?, USS Chicago returned to Guam following a western Pacific patrol.

August 3, The Chicago pulled into Subic Bay, Philippines, for a liberty port visit; Brief stop off White Beach Naval facility, Okinawa, for personnel transfer on Aug. 10.

August 1?, USS Chicago moored at Sierra Wharf in Apra Harbor following a two-month western Pacific patrol.

October 23, The Chicago moored at Akasaki Pier in Fleet Activities Sasebo for a four-day port call; Brief stop in Sasebo on Oct. 30.

December 16, USS Chicago moored at Berth 1, Sierra Wharf in Apra Harbor after completing a two-month western Pacific patrol.

February 22, 2016 The Los Angeles-class fast attack submarine departed Apra Harbor for a day-long VIP cruise; Brief underway again on Feb. 23.

March 7, The Chicago is currently underway in support of a Multi-Sail 2016 exercise, with Destroyer Squadron (DESRON) 15 and four Japan Maritime Self-Defense Force (JMSDF) ships, in the Guam Op. Area.

March 2?, USS Chicago departed Apra Harbor for a western Pacific patrol in support of Operation Heavy Thunder; Brief stop off White Beach, Okinawa, on April 2 and April 6; Returned home on May 8.

May 12, Cmdr. Brian T. Turney relieved Cmdr. Lance E. Thompson as CO of the SSN 721 during a change-of-command ceremony at the Naval Base Guam Theatre.

July 22, USS Chicago is currently moored at Berth 1, Sierra Wharf on Naval Base Guam.

November 8, The Chicago made a brief stop off White Beach Naval Facility in Okinawa, Japan, for personnel transfer; Brief stop again on Nov. 9.

November 11, USS Chicago participated in a photo exercise (PHOTOEX) with the USS Ronald Reagan (CVN 76) CSG-5 and Japan Maritime Self-Defense Force (JMSDF) ships, off the southwest coast of Japan, while underway in support of ANNUALEX 28G, the maritime component of the biennial exercise Keen Sword 17; Brief stop at White Beach, Okinawa, on Nov. 12.

November 1?, USS Chicago moored at Berth 1, Sierra Wharf in Apra Harbor following a two-month western Pacific patrol.

December 20, SSN 721 moored outboard the USS Emory S. Land at Alpha Wharf for a maintenance availability.

June 2, 2017 The Chicago is currently moored at Romeo 2 Wharf in Apra Harbor.

September 28, USS Chicago moored at Wharf S11 in its new homeport of Joint Base Pearl Harbor-Hickam, Hawaii, after a 23-day transit from Apra Harbor, Guam.

October 27, The Chicago moved from Wharf S11 to Wharf B1 on Pearl Harbor Naval Shipyard; Entered the Dry Dock #3 on Nov. 6.?

August 31, 2018 Cmdr. Chance Litton relieved Cmdr. Brian T. Turney as CO of the USS Chicago during a change-of-command ceremony at the USS Bowfin Museum and Submarine Park in Pearl Harbor.

September 8, USS Chicago undocked and moored at Wharf B1 on Pearl Harbor Naval Shipyard.

April 26, 2019 USS Chicago is currently moored at Wharf S21A on Joint Base Pearl Harbor-Hickam; Moored at Wharf W4, Naval Magazine Lualualei for ammo onload on April 29; Underway on April 30; Moored at Wharf Y2 on May ?.

October 8, SSN 721 moored at Pier S8 on Joint Base Pearl Harbor-Hickam after underway for routine operations.

May ?, 2020 USS Chicago moored at Wharf S11 on Joint Base Pearl Harbor-Hickam after underway for routine operations; Moored at Wharf Y3A on May ?.

June 2, The Chicago departed homeport for a two-day underway to conduct Encapsulated Harpoon Certification Training Vehicle (EHCTV) testing; Emergency sortied due to Hurricane Douglas on July 25; Moored at Pier S8 on July 28.?

August 25, USS Chicago departed Pearl Harbor for a scheduled western Pacific deployment.

September 14, The Chicago made a brief stop in Apra Harbor, Guam, for supplies before participating in a biennial exercise Valiant Shield 2020 with the USS Ronald Reagan CSG; Participated in a sinking exercise (SINKEX) of the ex-USS Curts (FFG 38), while underway off the northeast coast of Guam, on Sept. 19; Participated in a photo exercise (PHOTOEX) on Sept. 25.

September 29, USS Chicago made a brief stop off Yokosuka, Japan, for personnel transfer; Moored at Berth 13S on Fleet Activities Yokosuka from Oct. 2-6; Moored at Alpha Wharf in Apra Harbor for upkeep on Nov. 6; Moved to Berth 2, Sierra Wharf on Nov. 29; Departed Guam on Dec. 2; Brief stop in Apra Harbor on Jan. 31.

February 9, 2021 USS Chicago moored at Wharf S11 on Joint Base Pearl Harbor-Hickam following a five-and-a-half month deployment.

April 7, Cmdr. Andrew J. Kopacz relieved Cmdr. Chance Litton as CO of the Chicago during a pierside ceremony at Wharf S21B.

May 11, USS Chicago moored at Wharf W5, Naval Magazine Lualualei for ammo offload; Moored at Wharf S21B on May ?; Underway in support of training exercise Agile Dagger 2021 on June 4.

July 29, The Chicago moved from Pier S9 to Wharf W5, Naval Magazine Lualualei for ammo onload; Underway in support of Large Scale Exercise (LSE) 2021 on July 31.

August 15, USS Chicago participated in a sinking exercise (SINKEX) of the ex-USS Ingraham (FFG 61), off the northwest coast of Kauai.

February 10, 2022 The Chicago is currently moored at Wharf S21B on Joint Base Pearl Harbor-Hickam; Moored at Wharf W4, Naval Magazine Lualualei for ammo onload from Feb. 24-2?; Brief stop in Pearl Harbor for personnel transfer on Feb. 28, March 2, 8 and 11th; Moored at Wharf Y2 on March ?.

March 28, USS Chicago departed Pearl Harbor for its final western Pacific deployment.

June 25, USS Chicago moored at Berth 13S in Fleet Activities Yokosuka, Japan, for a five-day port visit; Brief stop off White Beach Naval facility, Okinawa, on July 3; Brief stop in Sasebo Harbor for personnel transfer on Aug. 11 and 16th.

November 2, USS Chicago moored at Wharf S1A on Joint Base Pearl Harbor-Hickam following a seven-month deployment.

January 6, 2023 The Chicago is currently moored at Pier S9 on Joint Base Pearl Harbor-Hickam; Underway en route to Bremerton, Wash., to commence a year-long inactivation process, on Jan. 8; Moored at Pier 6 at Puget Sound Naval Shipyard on Jan. 17.

January 24, SSN 721 is inactivated and placed in Reserve (Stand Down) status.

April 17, Cmdr. Robert J. Gillis relieved Cmdr. Andrew J. Kopacz as the last CO of Chicago during a change-of-command ceremony at the Naval Undersea Museum in Keyport, Wash.

July 21, USS Chicago held a decommissioning ceremony at the Naval Undersea Museum in Keyport, Wash., after a nearly 37-years of active service.