The Truman family boarded Missouri on 7 September 1947 to return to the United States and disembarked at Norfolk on 19 September. Her overhaul in New York, which lasted from 23 September to 10 March 1948 included upgrading most of her radar suite. The SK-2 system was replaced by a SR-3 radar and both SG fire-control radars were removed, an improved SG-6 replaced the forward antenna and the aft SG was exchanged for a SP height-finding radar; Mark 25 fire-control radars replaced the combination Mark 12/22 installations on the roofs of the Mark 37 directors. After the overhaul, the ship worked up at Guantanamo Bay. The summer of 1948 was devoted to midshipman and reserve training cruises. Also in 1948, Missouri became the first battleship to host a helicopter detachment, operating two Sikorsky HO3S-1 machines for utility and rescue work. The battleship departed Norfolk on 1 November 1948 for a second three-week Arctic cold-weather training cruise to the Davis Strait. During the next two years, Missouri participated in exercises from the New England coast to the Caribbean, alternated with two midshipman summer training cruises. She was overhauled at Norfolk Naval Shipyard from 23 September 1949 to 17 January 1950.
