like most guys of that generation, he didn't talked about the experience extensively.
Prior to WWII my dad was already a professional photographer, he was contracted out of Detroit and took photos of the CC Camps and when the build up started he photographed troops in training and sold the photos to the service men... until he got drafted.
The First Motion Picture Unit (FMPU) was located at Hal Roach Studios and one of the projects he was involved with was filming bombing runs that were used to train pilots, as well as films using a new version of the Norden Bombsight which had a 'best case' circular error probable (CEP) of 23m, in combat conditions the average CEP in 1943 was 370m... pin-point it was not. For the training films they used an 18x24 meter scale model at 10cm to 528m.
While my dad worked on some propaganda films, his area was still photography. There is an interesting story about Ansco Color Reversal film, which I remember he was still using in the late 1950s and early 1960s. The US based Ansco was driven out of business by Kodak (alleged patient infringement by Kodak) and was forced to merge with Agfa (to become part of German based Agfa-Ansco). They developed and producing Anscochrome (the afore mentioned color reversal film) with the advantage that it could be developed by individual photographers... it did not have to go to Kodak Labs for processing as Kodachrome did. Anscochrome was 'nationalized' during the war and you could not purchase it as a private citizen. It was a safety film and because it didn't burst into flames it got a lot of play in Hollywood.
You might recognize some names from a short list of The First Motion Picture Unit personnel: Frank Capra, Lee J. Cobb, Joseph Cotten, Clark Gable, Van Heflin, William Holden, DeForest Kelley, Alan Ladd, George Montgomery, Edmond O'Brien, Ronald Reagan, George Reeves, Dr. Seuss, Craig Stevens, Irving Wallace, Jack L. Warner, and William Wyler.
That's about all the detail I could accumulate ; )
Casey