Everyone here is officially wrong.
The Battle Field Tank.
It's actually just a tank with 20 weapons... but they're all so badass.
You get:
-2 kinds of classic pulse-guns
-2 kinds of mortars
-A napalm cannon
-A freon burst cannon to freeze targets (which can then be shattered instantly with a single pulse-gun shot)
-4 kinds of mines (detonation and proximity)
-A laser that rebounds off walls and incinerates enemies
-A laser that's similar to the last one, but once it hits an enemy, it begins charging. After 2 or 3 seconds of charge, the enemy is obliterated.
-A Sonic Burst cannon that fires waves of concentrated sound
-The "arc saber" which fires lightning that chains onto other enemies
-Lock-on missiles
-Tether guided (remote control) missiles
-Lock-on NUKES
-Tether guided NUKES
And it has four modes, Treads, Amphibious, Hover, and Sub.
Yeap. You lose.