This interesting information from Anne Collins Smith:
I think the "Anonymous Jerrie" in your picture is Norbert Meisel; he and another actor named Manfred Lating played most of the anonymous German characters on Rat Patrol. Recently I was visiting a friend who had a professional copy of a Really Bad Movie starring Eric Braeden and Tyne Daly (who was very young and thin), made just a few years after RP. What struck me about the movie was that it was produced by none other than. . . . Norbert Meisel! EB plays a drifter who is hired on to help an elderly man with some hard outdoor work; eventually the old man, who is infertile, asks EB to impregnate his wife. I think it was called The Adulteress, but I'm not sure.