Julian Reville

"We'll Meet Again"- Vera Lynn
"I'll Be Home For Christmas"- Bing Crosby, Doris Day, Johnny Mathis, or about 500 others
"Boogie Woogie Bugle Boy"- The Andrews Sisters
"I'll Be Seeing You"- Jo Stafford

StephenA

Machine Gun - Jimi Hendrix
Lost In A Lost World - The Moody Blues

My DVD Collection
I met him, fifteen years ago. I was told there was nothing left. No reason, no conscience, no understanding; even the most rudimentary sense of life or death, good or evil, right or wrong. I met this six-year-old child, with this blind, pale, emotionless face and, the blackest eyes... the Devil's eyes! I spent eight years trying to reach him, and then another seven trying to keep him locked up for I realized what was living behind that boy's eyes was purely and simply... evil! - Dr Sam Loomis(Halloween)

Damn you Mop N Glo! - Stewie (Family Guy)

Dan Stone

There is also a version of this song performed by D.O.A. which appeared on their War On 45 EP

Here's a couple nobody has mentioned so far, which were popular with soldiers during the Gulf war:

War Ensemble - Slayer
Mandatory Suicide - Slayer

MatthewKolden

I firmly believe that fish and humans can coexist in peace.

Sue_New

"Zombie" - The Cranberries

Chu Gai

Galveston - Glen Campbell

Ride 'em Jewboy - Kinky Friedman & the Texas Jewboys

Will_B

"World Destruction (Time Zone)" Public Image Limited (or was it Johnny Rotten and someone else?) is a classic.

"It's a Mistake" Men at Work (Colin Hay)

I'd say "North Country Girl" by Pete Townshend might qualify (the character in the song is wondering if a girl he knew was spared from nuclear fallout)

"Dust" by Robyn Hitchcock from the album You & Oblivion (another song about radioactive fallout)

"Fall Dog Bombs the Moon" David Bowie (and the whole of David Bowie's album "Heathen")

The Eurythmics album "Peace" has a few (and two great music videos of an orchestra being bombed and attacked by soldiers)