US Navy photographers, as late as Korea used Graflex cameras. I worked for a man that covered Korea, and that was one that he used (the other, I think was a 2.25). When I was in the Army during the Viet Nam days, Nikon F(s) were the service camera. I guess it was far enough from WWII to use a Japonese camera, the Navy used Bessler Topcon(s).