My mother is a hospice RN and one of her patients had this unit insignia(?) on his door. He recently passed away and it's still on his door (it's at a nursing home for veterans). He was General George Pattons mechanic. Unfortunately I didn't get around to getting to talking to him about his experiences (he would actually talk to my mom about some of his experiences), and I deeply regret not getting to talk to him. Here's the insignia. Thanks for any feedback!