My guy cusses like a fighter pilot. Because he's a fighter pilot.
However I've kept it to "Damn" "Goddamn" "Ass" and "Bastard". The F, B, D, P, and C words never cross my lips. The S word, if ever invoked, is just "Oh Sh-"
Needless to say the worst I can call someone is a "Goddamned Bastard", and usually the swears are just exclamatory. "Aw Hell, Goddamnit, I lost my damned target.." It's little different than the RM going "VERDAMMT!" but with more fighter pilot undertones and more English.
Note that, in reality, this is cleaner than your average eight year old. Play Xbox Live for more than an hour and you'll get my point. If you still don't get it, ride a bus home with elementary students every day, and sit near the front where the youngest kids gather. If you still don't get it, jump off a bridge and hopefully a little kid walking around nearby will shout a given expletive.
