in general, no. But there are exceptions... I think it's cool when military men or fraternity men have their letters or branch (ie. USMC, USAF) tattoed DISCREETLY on their upper arm. No big ol display, just a couple of letters.

My boyfriend has a tattoo of an @ sign on his shoulder (it isn't near as dorky as it sounds...there is a story behind it) - and while I don't particularly care for it, it could be so very much worse.