May be if i was the boss (captain) and could decree anything I wanted I's say only mods with built in batteries and nothing above 100 watts max. I might arrange to have ecigs available for sale if the ship has a commisary. I might go a step further and say only OEM chargers or chargers with a UL listing and I'd sell good ones in the commisary. vaping is an asset to the military if it keeps sailors in better health. Most will get VA benefits.