In 1950 North Korea invaded South Korea, prompting the United States to intervene in the name of the United Nations. President Harry S. Truman was caught off guard when the invasion struck, but quickly ordered U.S. Forces stationed in Japan into South Korea. Truman also sent U.S. based troops, tanks, fighter and bomber aircraft, and a strong naval force to Korea to support the Republic of Korea. As part of the naval mobilization "New Jersey" was recalled from the mothball fleet to provide seaborne artillery support for U.N. and South Korean troops. "New Jersey" was recommissioned at Bayonne on 21 November 1950, Captain David M. Tyree in command, and proceeded to the Caribbean, where she welded her crew into an efficient body which would meet the demanding requirements of the Korean War. She sailed from Norfolk, Virginia 16 April 1951 and arrived from Japan off the east coast of Korea 17 May. Vice Admiral Harold M. Martin, commanding the United States Seventh Fleet, placed his flag in "New Jersey" for the next six months.