From 1938 to 1940, Bullock became deeply involved in exploring alternative processes such as solarization and bas relief. After graduation from Art Center, his experimental work was exhibited in one of L.A. County Museum's early solo photographic exhibitions. During the early 40s, he worked as a commercial photographer and then enlisted in the Army. Released from the military to photograph for the aircraft industry, he was first employed at Lockheed and then headed the photographic department of Connors-Joyce until the end of the war.