[JamesSwift]

Very common in all branches, it just differs based on what the job is. Mechanics? Probably less likely. Intel? Way more likely.

[Wohlf]

Can confirm it was fairly common in the Marine Corps, even some of the grunts and motor transport guys would get interested on ship duty. When you're bored as hell you'll take anything you can get.

[wyldberry]

Boredom and creativity go hand in hand. Not necessarily good creativity. On my first deployment i chugged a bottle of syrup for $50 bucks and gave the corpsman heart attacks. It is not fun throwing up syrup for an hour after.

[poulsbohemian]

>Mechanics? Probably less likely.

Coincidentally, my partner's father was an airplane mechanic stationed in Okinawa in the 1980s... and apparently played a lot of D&D.