I have a lot that belonged to a Canadian Spitfire pilot who served overseas. Amongst his bits and pieces is a small buzz bomb pin. It is about 1" long and made of brass with a screw post soldered onto the back. It is held on with a nut. Apparently it was made on the station by one of the mechanics. When I saw the force pin, my first thought was that it was made by one of the Force guys (perhaps a rigger as Ken suggested) as a sweetheart pin. That would be my guess.