The Patrick Gallagher (DDG 127) is the 77th Arleigh Burke-class guided-missile destroyer and the first ship in the United States Navy named in honor of Marine Corps Cpl. Patrick Gallagher (1944-1967), who received the Navy Cross for heroism during the Vietnam War.

March 30, 2022 The keel authentication ceremony for the future USS Patrick Gallagher was held at the Bath Iron Works shipyard.

July 27, 2024 The Pre-Commissioning Unit (PCU) Patrick Gallagher was christened during an 11 a.m. EDT ceremony at Bath Iron Works in Bath, Maine. Teresa Gallagher Keegan, Rosemarie Gallagher and Pauline Gallagher, the sisters of the ship's namesake, served as sponsors of the ship. Cmdr. Matthew E. Dryden is the prospective commanding officer.

October 15, The Pre-Commissioning Unit (PCU) Patrick Gallagher was launched from a floating dry-dock and moored at Pier 2 on Bath Iron Works shipyard.

April 27, 2026 PCU Patrick Gallagher departed Bath Iron Works shipyard for the first time to conduct Builder's (Alpha) trials; Moored at Berth 2, Ocean Gateway Pier in Portland, Maine, for personnel transfer from April 28-29; Moored at Pier 3, Bath Iron Works shipyard on May 2.

May 29, U.S. Navy officially accepted delivery of the future USS Patrick Gallagher during a brief ceremony aboard the ship.

July 17, BAE Systems Norfolk Ship Repair was awarded a $24,4 million modification to a previously awarded contract (N00024-25-C-2301) for the USS Patrick Gallagher's Post Shakedown Availability (PSA). Work is expected to be completed by August 2027.