On May 1, 1952, 14 months after his promotion to captain in the Marine Corps Reserve, Williams was recalled to active duty for service in the Korean War. He had not flown any aircraft for eight years but he turned down all offers to sit out the war in comfort as a member of a service baseball team. Nevertheless, Williams was resentful of being called up, which he admitted years later, particularly regarding the Navy's policy of calling up Inactive Reservists rather than members of the Active Reserve.