I've probably told everyone I know about these, but I just have to link to DocII's amazing Combat! songvids here anyway. She's got them up on YouTube right now:
Saunders ("Ride Across the River" by Dire Straits)
Kirby ("Blaze of Glory" by Jon Bon Jovi from the Young Guns II soundtrack)
Caje ("Born on the Bayou" by Creedence Clearwater Revival)
Doc ("Sound the Bugle" by Bryan Adams)
I think Kirby's is my favorite, then Doc's. Although how can I not love watching the Saunders one, with six minutes of my beloved sergeant sauntering about, looking so delicious he defies description. Part of the reason I like Kirby's best, of course, is because I love the song "Blaze of Glory" and the entire album it's on. In fact, I'm listening to that cd right now ;-)
Half the fun with these is seeing how many scenes I recognize, how many I can say, "Yeah, that's from such-and-such ep." It's not really all that many, mostly because I haven't seen about a third of the eps (oh glorious thought!), and also because a lot of the shots are kind of generic.