"A Well moderated board that is a benevolent dictatorship, not a democracy" In business since June 16, 2010
I remember reading about training a small group of US Marines in parachuting early in WW II. It was discontinued for a number of reasons, very likely your father was one of that small group? I was taught glass cutting by an uncle long ago, (Thanks Riley), have cut down a lot of window glass, and broken some. A necessary thing when living in a house whose windows are no longer considered a standard size. Something I do while cutting is to do it on the flattest surface available.
I have this pin that I got from McDonnell Douglas but it is a little big at 3-1/2"diameter and it has a clip on the back. I know you like space stuff so just say the word and it is yours.