The lights are on
Scientifically Best Weapons
The following is not based on personal preference.
Sub Machine Guns
#1: UMP 45
Light Machine Gun
#1: AUG HBAR
#1: Barrett .50 Cal
#1: M93 Raffica
#2: USP 45
Stinger for anti-air, RPG for infantry.
Care packages great for people who honestly can't get higher killstreaks.
At earlier levels to compete with the higher rank players always have UAV as your first killstreak. This will help you team win since they will know most enemy positions and you will even get points for activating UAV's.
Tactical Nuke killstreak combo
Harrier Strike, Chopper Gunner or AC-130, Tactical Nuke
Normal killstreak combo (11)
Predator Missile, Harrier Strike, Chopper Gunner/AC-130
Normal killstreak combo (7)
UAV, Predator Missile, Harrier Strike
Casual gamer killstreak combo
UAV, Care Package, Predator Missile
Knifer killstreak combo
UAV, Counter-UAV, Predator Missile
Team player killstreak combo
UAV, Counter UAV, Sentry Gun/EMP