Remaining on active duty with the Pacific Fleet from World War II into 1960, "Collett" alternated local operations and cruises along the west coast with tours of duty in the Far East, the first of which came in 1946–1947. She was in the Far East upon the outbreak of the Korean War in June 1950, and after patrolling off Pusan from her base at Sasebo, and escorting cargo ships laden with military supplies to Korea, she sailed up the difficult channel to Inchon on 13 September to begin the preinvasion bombardment. She carried out her mission, although hit four times by counterfire which wounded five of her men, and on the 15th, returned with the invasion force, to whom she provided gunfire support once the landings had been made, as well as protective cover at sea. Her outstanding accomplishment in the invasion of Inchon was recognized with the awarding of the Navy Unit Commendation. After taking part in the Wonsan landings on 26 October, she returned to San Diego, California 18 November 1950.