Even if someone has used it only once, even if they just tried it, they are ineligible for military service.
Well that’s just false. You’ll get denied if you pop hot on a drug test at MEPS, but they don’t tend to care if you’ve smoked in the past, except as a barometer for if you’ll smoke in the future. And, like almost everything else in the DoD, there’s a waiver form you can fill out for it too
Baseball cap at a baseball game over the weekend, or a hard hat at work last night, depending if you count that as a hat