I finally spotted Hungry Joe, before he gets cut in two!
After watching the film many times since 1970, I finally spotted two brief appearances of the character of Hungry Joe, played by Seth Allen, before he is cut in two (Kid Sampson, not Hungry Joe, was the character who was cut in two in the book, but I digress) by McWatt's plane's propeller on the raft at the beach.
In the scene in which General Dreedle arrives and exits his staff car outside the briefing room, seen by Yossarian and the others through the window, Hungry Joe is the photographer who is scrambling around the General's car trying to take a picture as Dreedle, Moodus and Dreedle's WAC (a nurse in the book) get out of the car. He can also be seen manuvering around trying to take photos at the medal ceremony in which Yossarian appears naked.
Blink and you'll miss him, but that's Hungry Joe!