MW3 running/gunning on larger boards, ACR/ kick/ silencer secondary weapon is the MP9 with silencer (the absolutely best secondary and deadlier than most main guns on mw3) Scavenger / Assassin / stalker. Specialist package / slight of hand/ quick draw/ extreme conditioning.
Tactical is portable radar (always) Lethal is C4
close up running/gunning is pp90M1 / Rapid fire/ Range. RPG secondary - Slight of hand/ Assassin/ Stalker - Specialist package / Scavenger / quick draw/ extreme conditioning.
Camping when the urge hits or Spawn trapping (have had over 80 kills with this set up in one game)
LSW/ silencer/ Acog scope - Scavenger / Assassin / marksman (can sub for stalker, but LSW has great range and Marksman can show you people farther away to get a quick kill)
Assault package, Care package / Predator missile / helicopter
Portable radar (always) & C4