I have 3 classes

I am 9th prestige,and have 10 class slots. 1st one is
UMP45 Extended Mags
OMA
OMA Pro
Hardline Pro
Ninja Pro
then
Barret 50. cal w/ extended mags
OMA
OMA Pro
Stopping Power Pro
Commando Pro (for maps like Afghan and underpass where there are high spots, so i can jump off in a tricky situation)
and last, but by no means least
TAR 21 w/ Grenade Launcher
OMA
OMA Pro
Danger Close Pro
Ninja Pro
And basically, depends what map it is, if its scrapyard, wasteland or any map where I can get a noob tube from one side of the map, to the enemy teams capture point, I go for the 3rd class, and i get a few kills with that, until they capture it, then I swap to my UMP45, and run around raping, if i see that people are crowded together, 3rd class, booom nube tube.
I played 8 games, got 7 nukes, and on one the match ended because it was a TDM, and i was in chopper gunner, but i got a 44 killstreak