For this very reason I vote either Herb Albert and the Tijuana Brass, Slim Whitman or Tom Jones.
Just imagine, “What’s new pussycat” BOOM “wooo-owoo-owoo” BOOM.
You Drop The Bomb On Me, as played by the Tennessee Tech Tuba Ensemble.
For some reason I just visualized a tank spinning the turret around and around while that “You Spin Me Round” song plays. 
“Me and You, and a dog named Boo”
“Bicycle Races” by Queen
Depends upon the situation; if it’s one of those, “it’s bad, and it’s only gonna get worse” situations, #2 may be appropriate.
Out of fuel, become a bunker.
Out of ammo, become a pillbox.
Out of hope, become a hero.
[Scary movie announcer voice] Coming soon to a theater near you! [/SMAV]
I was thinking “Walking on Sunshine” for the same reason.
In reference to the Firefly/Serenity thread going right now, I think Whitney Houston’s “I Will Always Love You” song could be useful as psychological warfare.
Ride the Tiger from Jefferson Starship
The Star-Spangled Banner - Jimi Hendrix at Woodstock. A live fire fight would just amp up the sound effects a bit.
Smoke on the Water by Deep Purple
[QUOTE=chrisk]
I’m sorry - this is one of those occasions where you DON’T mess with the classics.
“Ride of the Valkyries” by Richard Wagner. No other alternatives.
[U **in britain the valkyries is the official anthem of the paratroops ,dont think that they`d take too kindly to tankies "borrowing it " lol !]
Sorry Tuckerfan, that movie came out years ago.
So? Ya think Jerry Bruckheimer can’t do a remake? 
Fatboy Slim’s song Weapon Of Choice and The Chemical Brother’s Hey Boy, Hey Girl seem oddly appropriate too… along with The Prodigy’s Smack My Bitch Up and Armand Van Helden’s song Koochy…
Coming up next, the Top Ten reasons Martini Enfield shouldn’t be allowed to have a modern Armoured Fighting Vehicle!