USS Green Bay (LPD 20), a San Antonio-class amphibious transport dock, is the second ship of the United States Navy to be named for the city in Wisconsin.

The contract to build her was awarded to Northrop Grumman Ship Systems, Avondale Division of New Orleans, Louisiana, on May 30, 2000, and her keel was laid down on August 11, 2003. Green Bay was christened on July 15, 2006. Rose Magnus, wife of the assistant commandant of the Marine Corps, General Robert Magnus, served as the ship’s sponsor. PCU Green Bay is scheduled to be commissioned in 2008 and be assigned to the Atlantic Fleet. Cmdr. Calvin Slocumb is the ship's prospective commanding officer.

August 6, 2008 PCU Green Bay completed Acceptance Trials on Aug. 1, sailing from and returning to the Northrop Grumman Shipbuilding (NGSB) shipyard in New Orleans.

September 5, U.S. Navy accepted delivery of the Green Bay from Northrop Grumman Shipbuilding (NGSB) in New Orleans, La., Aug. 29.

December 17, LPD 20 arrived in its new homeport of San Diego for the first time.

January 24, 2009 USS Green Bay is commissioned during a 10 a.m. ceremony in Long Beach, Calif.

September 23, The amphibious transport dock pulled to Pearl Harbor Naval Station for a routine port visit.

September 29, The Green Bay is currently conducting Combat System Ship Qualification Trials (CSSQT) off the coast of Hawaii.

October 10, USS Green Bay arrived in San Francisco to participate in Fleet Week 2009.

June 10, 2010 LPD 20 recently welcomed 72 Midshipmen from the United States Naval Academy for a two-day cruise off the coast of southern California as a part of summer training.

June 11, Cmdr. Kevin P. Meyers relieved Cmdr. Joseph R. Olson of the Green Bay during a change-of-command ceremony at Naval Base San Diego.

August 3, USS Green Bay arrived in Port of Seattle to participate in the 61st annual Seattle Seafair Fleet Week.

November 5, The amphibious transport dock is currently underway off the coast of southern California, conducting Composite Training Unit Exercise (COMPTUEX).

February 22, 2011 USS Green Bay departed Naval Base San Diego for its maiden deployment, as part of USS Boxer (LHD 4) Amphibious Ready Group (ARG).

February 28, The Green Bay pulled into Joint Base Pearl Harbor-Hickam for a routine port call.

July 13, Capt. J. Curtis Shaub, Commodore, Amphibious Squadron (PHIBRON) 1, fired XO Cmdr. Ralph C. Jones "after an investigation substantiated allegations of personal misconduct."

July 18, LPD 20 is currently anchored off the coast of Kuwait Naval Base participating in a bilateral amphibious exercise Eager Mace 11-2, between the U.S. and Kuwait Armed Forces.

August 22, The amphibious transport dock anchored off the coast of Phuket for a three-day visit to Thailand.

September 2, The Green Bay arrived in Darwin, Australia, for a scheduled port visit.

September 30, USS Green Bay returned to homeport after a seven-month deployment in the U.S. 5th and 7th Fleet Areas of Responsibility.