Skivvy Wavers live in a little hut on top of the bridge where they figure no one on the bridge can ever see what they do. This, of course, is a great place for others to go screw off, especially if there is something interesting to look at through the big binoculars. A little, as in time or quantity. Adopted from the Brits. Snap to To come to attention.
Snipes live down below and can occasionally be see emerging from small hatches in the main deck.
SOG Sonarman rate, changed to STG in mid sixties. SPs Shore Patrol. Your buddies with an armband and a night stick. Sparks A radioman. A World War II term for any minesweeper.