Casey hoped to become Chief of Engineers when Lieutenant General Raymond A. Wheeler retired in 1948, but President Harry S. Truman passed him over in favor of the Missouri River Division Engineer, Major General Lewis A. Pick. Instead, Casey remained in Japan as MacArthur's Chief Engineer until Casey's retirement on 31 December 1949. He edited "Engineers of the Southwest Pacific", a seven-volume series about their wartime service. He received a number of foreign awards for his service, including the Distinguished Service Star from the Philippines, the Commander of the Order of the British Empire from Australia, the Commander of the Order of Orange-Nassau from the Netherlands, and the Officer of Légion d'honneur from France.