The scene: a lady paging through her family albums chances upon an old photo that piques her curiosity.Several young men in uniform, possibly 19th Century European, are joyously posing for the camera with -- banjos and ukeleles. They have billed caps, and the insignias thereon appear to have been either removed, or cut off. I did a double-take when I saw the chevrons.I made a guess, and I have a couple more, but they are only guesses, and there are a lot of 'way-more-smarterer-than-me of you...