The Portland (LPD 27) is the 11th San Antonio-class amphibious transport dock ship and is named in honor of city of Portland, Oregon.

August 2, 2013 The keel authentication ceremony for the LPD 27 was held at Huntington Ingalls Industries, Ingalls Operations shipyard in Pascagoula, Mississippi.

February 13, 2016 The Pre-Commissioning Unit (PCU) Portland was launched from a floating dry-dock at Ingalls shipyard in Pascagoula, Miss., and moored at Ingalls West Bank Yard East Wharf.

May 21, PCU Portland was christened during a 10 a.m. CDT ceremony at Ingalls West Bank in Pascagoula, Mississippi. Mrs. Bonnie Amos, the wife of U.S. Marine Corps Gen. James F. Amos (Ret.), served as sponsor of the ship. Capt. Jeremy R. Hill is the prospective commanding officer.

June 30, 2017 The Portland returned to Ingalls shipyard after a three-day underway, in the Gulf of Mexico, for Builder's trials; Underway for acceptance trials with the INSURV from Aug. 16-18.

September 18, U.S. Navy accepted delivery of the LPD 27 during a short ceremony aboard the ship at Ingalls West Bank Yard East Wharf.

December 14, PCU Portland departed Pascagoula, Miss., for the last time en route to San Diego, California.

December 22, The Portland moored at N/S/O Mole Pier on Naval Air Station Key West, Fla., for a four-day liberty port visit; Moored at Wharf C1 in Naval Station Mayport, Fla., from Dec. 28-30.

January 2, 2018 PCU Portland moored at Bravo Wharf on Naval Station Guantanamo Bay, Cuba, for a four-day port call; Transited the Panama Canal on Jan. 9.

January 15, The Portland moored at Cruise Pier in Port of Manzanillo, Mexico, on late Monday evening for a three-day liberty visit.

January 22, The Pre-Commissioning Unit (PCU) Portland moored at Berth 2, Pier 8 in its homeport of Naval Base San Diego for the first time.

April 2, The amphibious transport dock ship departed homeport for routine training off the coast of southern California; Anchored at Coronado's Anchorage 171 for a brief stop on April 2; Moored at Bravo Pier, Naval Air Station North Island for a brief stop to onload equipment on April 3; Moored at Navy Fuel Farm (NFF), Naval Base Point Loma for a brief stop to refuel before moored at Berth 2, Pier 8 on April 5.

April 9, LPD 27 departed Naval Base San Diego en route to Portland, Oregon; Moored at Pier 1N in Port of Astoria, Ore., from April 12-14; Moored at Marine Terminal 2 in Port of Portland for a nine-day visit, in preparation for its commissioning ceremony, on April 14.

April 21, USS Portland was commissioned during a 10 a.m. PDT ceremony in its namesake city.

April 27, The Portland moored at Berth 2, Pier 8 on Naval Base San Diego; Underway for deck landing qualifications and gunnery exercise (GUNNEX) on May 14.

May 15, USS Portland conducted its first ever underway replenishment (UNREP), with the USNS Henry J. Kaiser (T-AO 187); Moored at Berth 5, Pier 3 on May 17.

May 21, USS Portland moored at Bravo Pier, Naval Air Station North Island for a brief stop to onload ammo before underway for Combat Systems Ship’s Qualification Trials (CSSQT) in the Hawaiian Op. Area.

May 29, The Portland moored at Pier M2 on Joint Base Pearl Harbor-Hickam for a six-day port call; Moored at Pier M1/M2 again from June 8-20.

June 12, BAE Systems San Diego Ship Repair Inc. was awarded a $19 million modification to previously awarded contract (N00024-16-C-2439) for the USS Portland's Post Shakedown Availability (PSA). Work is expected to be completed by July 2019.

July 19, USS Portland moored at Wharf B25 on Joint Base Pearl Harbor-Hickam for a five-day port call; Moored at Pier M1/M2 for emergent repairs from July 24-30.

August 6, The Portland conducted a replenishment-at-sea with the USNS Guadalupe (T-AO 200), while underway off the coast of southern California; Brief stop at Bravo Pier before moored at Berth 1, Pier 6 in Naval Base San Diego on Aug. 8; Underway again from Sept. 4-7.

September 13, USS Portland moored at Berth 6, Pier 5 on Naval Base San Diego after a one-day underway in the SOCAL Op. Area.

September 21, Capt. Jesus A. Rodriguez relieved Capt. Jeremy R. Hill as the 2nd CO of LPD 27 during a change-of-command ceremony on board the ship.

October 5, USS Portland moored at Berth 5, Pier 8 on Naval Base San Diego after a two-day underway off the coast of southern California; Underway again from Oct. 24-25.

October 29, The Portland moored at Deperming Pier on Naval Base Point Loma for magnetic treatment (DEPERM); Underway for degaussing runs before moored at Berth 5, Pier 7 on Nov. 7.

July 26, 2019 USS Portland experienced an engineering casualty after underway from Naval Base San Diego at 0900 local time, following an eight-month Post Shakedown Availability (PSA), to conduct sea trials and emergency anchored at A-215 in North San Diego Bay; Moored at Berth 5, Pier 7 on Friday afternoon; Underway again on July 29.

July 30, The Portland moored at Navy Fuel Farm (NFF) on Naval Base Point Loma for a brief stop to refuel; Returned home on Aug. 3; Underway again from Aug. 27-28.

September 6, USS Portland moored at Berth 5, Pier 4 on Naval Base San Diego after a two-day underway in the SOCAL Op. Area; Underway for amphibous warfare certification, off the coast of Camp Pendleton, on Sept. 17; Moored at Berth 5, Pier 7 on Sept. 20; Underway again from Sept. 30- Oct. 4 and Oct. 8.

October 15, USS Portland moored at Wharf 311 on Naval Weapons Station Seal Beach, Calif., for a two-day ammo onload; Returned home on Oct. 18; Underway again from Nov. 19-22 and Dec. 2-6.

December 13, The Portland moored at Berth 1, Pier 6 on Naval Base San Diego after a four-day underway for routine training.

December 19, Capt. Karrey D. Sanders relieved Capt. Jesus A. Rodriguez as CO of the Portland during a change-of-command ceremony on board the ship.

January 17, 2020 USS Portland returned to homeport after a nine-day underway off the coast of southern California; Underway in support of annual exercise Iron Fist 2020, with the elements from 11th Marine Expeditionary Unit (MEU) and Japanese Ground Self-Defense Force (JGSDF), from Feb. 4-14.

March 7, LPD 27 moored at Berth 1, Pier 12 on Naval Base San Diego after a five-day underway in the SOCAL Op. Area; Underway again on March 11; Moored at Berth 5, Pier 4 on March 13; Underway again on April 15; Moored at Wharf 4 in Port Hueneme, Calif., from April 20-24.

April 29, USS Portland moored at Berth 1, Pier 6 on Naval Base San Diego; Underway for Solid State Laser Weapons System Demonstrator (LWSD) testing, at the Point Mugu range, from May 11-18; Underway again on June 9; Moored at Bravo Pier for a brief stop before returned home on June 12; Day-long underway on June 30.

July 28, The Portland moored at Berth 1, Pier 6 after a week-long underway for training exercise, off the coast of San Clemente Island and Camp Pendleton; Moored at NFF for a brief stop to refuel before underway again on Sept. 22; Returned home on Sept. 25.

October 19, USS Portland moored at Bravo Pier on NAS North Island for a brief stop to onload ammo before underway for routine training; Returned home on Oct. 23; Brief underway on Oct. 28; Underway again on Nov. 2.

From November 3-5, the Portland conducted operations off the west coast of San Nicolas Island; Returned home on Nov. 6; Underway in support of amphibious landing exercise Steel Knight/Dawn Blitz 21, with the elements from 1st Marine Division, from Dec. 2-14.

January 11, 2021 USS Portland departed homeport for a Surface Warfare Advanced Tactical Training (SWATT) exercise, as part of the USS Essex (LHD 2) ARG; Moored at Bravo Pier for a brief stop to onload ammo on Jan. 13; Moored at Berth 1, Pier 6 on Jan. 22; Underway again from Feb. 1-5.

April 1, USS Portland moored at Berth 1, Pier 6 on Naval Base San Diego after a 13-day underway for Amphibious Squadron (PHIBRON) 1/Marine Expeditionary Unit Integration Training (PMINT), with the 11th MEU; Underway for ARG/MEUEX from April 12-30; Underway for Composite Training Unit Exercise (COMPTUEX) on May 11; Moored at Berth 2, Pier 6 on May 27; Underway again from July 6-9 and July 24; Moored at Wharf 311, NWS Seal Beach for ammo onload from July 26-28; Returned home on July 29.

August 4, USS Portland departed San Diego for a scheduled Middle East deployment.

August 6, Capt. Matthew C. Thomas relieved Capt. Karrey D. Sanders as CO of the Portland during a brief ceremony in the ship's pilot house.

August 14, The Portland conducted a replenishment-at-sea with the USNS Washington Chambers (T-AKE 11), while underway in the Hawaiian Op. Area; Moored at Berth 3, Tango Wharf in Apra Harbor, Guam, from Aug. 25-28; Transited the Surigao Strait southbound on Sept. 1; Transited the Strait of Singapore westbound on Sept. 5; Transited the Strait of Hormuz northbound on Sept. 17.

September 18, USS Portland conducted a replenishment-at-sea with the USNS Wally Schirra (T-AKE 8), while underway in the Arabian Gulf; Moored at Berth 6, Khalifa Bin Salman Port (KBSP) in Hidd, Bahrain, from Sept. 28- Oct. 3; Transited the Strait of Hormuz southbound, along with the USS Sentry (MCM 3) and USS Gladiator (MCM 11), on Oct. 4; Conducted a replenishment-at-sea with the USNS John Lenthall (T-AO 189) on Oct. 14.

October 15, USS Portland moored at Southern General Cargo Terminal in Jeddah Islamic Port, Saudi Arabia, for a two-day visit before participating in exercise Indigo Defender 21; Participated in a PHOTOEX on Oct. 25; Participated in a PASSEX with the ENS Taba (F916) on Oct. 28; Transited the Strait of Tiran northbound on Oct. 31.

November 1, LPD 27 moored at Port of Eilat, Israel, for a four-day visit to offload Marines and vehicles in support of interoperability exercise; Moored at Aqaba Naval Base, Jordan, from Nov. 6-10; Participated in a PASSEX with the INS Hanit, while underway in the Gulf of Aqaba, on Nov. 15; Inport Eilat again from Nov. 15-17; Transited the Bab-el-Mandeb Strait southbound on Nov. 21.

December 3, USS Portland recently moored at Tanker Berth 11 in Port of Djibouti, Djibouti, for fuel and supplies; Conducted a replenishment-at-sea with the USNS Wally Schirra, while underway in the Gulf of Aden, on Dec. 16; Moored at Tanker Berth 11 in Port of Djibouti again from Dec. 26-27.

January 4, 2022 USS Portland moored at Navy Terminal in Port of Duqm, Oman, for an 11-day port call; Transited the Malacca Strait southbound from Jan. 24-25; Moored at Berth 4, RSS Singapura from Jan. 25-26; Conducted deck landing qualifications with the U.S. Army's CH-47F Chinook, assigned to 25th Combat Aviation Brigade (CAB), while underway off the coast of Kaneohe Bay, Oahu, on Feb. 18.

February 19, The Portland moored at Pier H2 on Joint Base Pearl Harbor-Hickam, Hawaii, for a two-day port call; Conducted a replenishment-at-sea with the USNS Pecos (T-AO 197) on Feb. 27; Arrived off the coast of Camp Pendleton for offload on March 1.

March 4, USS Portland moored at Berth 1, Pier 12 on Naval Base San Diego following a seven-month deployment.

April 8, The Portland departed homeport for routine operations off the coast of southern California; Moored at Wharf 311, NWS Seal Beach for ammo offload from April 11-14; Moored at Berth 6, Pier 7 on April 15; Moved to Berth 2, Pier 8 on April 18; Underway again on May 22.

May 23, USS Portland moored at Berth 49, Outer Harbor in Port of Los Angeles, San Pedro, Calif., for an eight-day visit to participate in annual Fleet Week celebration; Returned home on June 2; Underway again on June 13.

June 17, The Portland moored at Kilo Pier on Naval Air Station North Island; Moved to Berth 5, Pier 8 on June 23; Moved to Berth Lima, NAS North Island for onload on June 29; Underway in support of Rim of the Pacific (RIMPAC) 2022 on July 11; Moored at Berth Lima again from July 15-18; Brief stop at NFF to refuel before moored at Berth Lima on July 20; Underway again from July 25-31.

August 3, USS Portland moved from NAS North Island to Berth 2, Pier 8 on Naval Base San Diego; Underway again from Aug. 28-30.

October 12, Continental Maritime of San Diego was awarded a $15 million contract for the USS Portland's Selected Restricted Availability (SRA). This contract contains options which, if exercised, will bring the cumulative value to $38,2 million and the work is expected to be completed by October 2023.

November 7, USS Portland moored at Berth 2, Pier 8 on Naval Base San Diego after a six-day underway in the SOCAL Op. Area.

November 17, Capt. James T. Robinson relieved Capt. Karrey D. Sanders as Commander, Amphibious Squadron (PHIBRON) 1 during a change-of-command ceremony on board the Portland.

November 18, Rear Adm. James A. Kirk relieved Rear Adm. Michael W. Baze as Commander, Expeditionary Strike Group (ESG) 3 during a change-of-command ceremony on board the Portland.

December 3, USS Portland moored at Berth 2, Pier 8 on Naval Base San Diego after a four-day underway in the SOCAL Op. Area; Underway in support of the NASA's Artemis I mission on Dec. 7; Recovered the Orion space capsule, approximately 100 n.m. south of Guadalupe, on Dec. 11; Returned home on Dec. 13.

December 23, Continental Maritime of San Diego was awarded an $8,5 million modification to a previously awarded contract (N55236-23-C-0001) for the USS Portland's Selected Restricted Availability (SRA).

January 9, 2023 USS Portland moved "dead-stick" from Naval Base San Diego to Continental Maritime of San Diego (CMSD) shipyard; Moved "dead-stick" to Berth 5, Pier 4 in Naval Base San Diego on Oct. 25.