 In 1946, he was one of a small group of Britons permitted to observe the U.S. nuclear bomb tests at Bikini Atoll.He commanded the destroyer HMS "Scorpion", and then served in the Admiralty, and as Chief Staff Officer to the Flag Officer Submarines, before taking command of the destroyer HMS "Battleaxe" and becoming Captain D of the 6th Destroyer Flotilla in 1955.In 1956, Hezlet was appointed as Director of the Naval Staff College at Greenwich.