On my ship we had a Barney Fife approach -- in port there was a sailor on the quarterdeck with a pistol but the mag was kept on the belt.

Sailors could have private firearms aboard for E-4 and above. I had a .22 High Standard auto. Each weapon was registered with the ship and locked up in an armory with the ammo stored separately.

Marines carried all kind of shyte from sidearms to mortars. They were locked-up, too. I think we locked the marines up separately, but that was understandable.

Bet rules ail have to change a bit when we get personal rail guns.