Here's my stupid question: I know if you lateral move in the Marine Corps to another MOS that you keep your wings. I also know if an officer fails to select for promotion twice that they generally must vacate their commission. Hypothetically, if an officer, Navy or Marine, had to vacate his commission and opted to enlist to finish out his time till retirement, would he keep his wings? Provided he was not FNAEB'd? He wouldn't be able to fly anymore, but I've seen officers PDQ'd keep theirs.
For a while there was a Marine SNCO (don't remember his rank) around NASP with NFO wings. Story was that he'd got his commission and was an A-6 BN, then got RIF'ed with the '90's draw-down. He opted to revert to his prior enlisted rank to get a few more years before retirement.
Once you earn you wings, you rate wearing them unless specifically stripped of them by a FNAEB.