After World War II, Boehm left the Navy briefly, but reenlisted after a few months of civilian life. He served as Chief Boatswain's Mate aboard the during the Korean War providing fire support for the Marine Corps landing at Inchon and covering the retreat at the Chosin Reservoir. In 1955 Boehm went through UDT (Underwater Demolition Team) training at the age of 31. Because of his prior experience as a deep-sea diver he had the opportunity to test prototype submersibles and swimmer-delivery vehicles. Eventually he was commissioned as an officer.