[AlternateGray]

I've watched a sergeant shoot himself in the foot while showing a group of privates how to clear a weapon (i.e., how to make sure there's no rounds left inside)...
I've seen an IED go off dead center on a Humvee- the glorious thing being that the moron who set it used an illumination artillery round instead of a high-explosive one, thus treating us all to a harmless, but pretty, fireworks show.
The best one, though, has to be the marine who accidentally discharged an anti-tank missile over/across an air field while giving a class on how to use it. (The thing has something like 6 safeties on it).

(By the way, the soldier/marine above are two of the very few exceptions, not the rule. Or we'd all be dead, of course.)