KILLSTREAK KINGPIN
Complex Says: Step 1: Get Hardline Pro. Step 2: Select SAM Turret/Care Package/Sentry Gun. That means you only need 3/4/5 kills to get them, respectively. Of course, the Pro version of the perk means that whatever reward the care package crate comes down as (say, another Spy Plane)—or whatever the SAM turret or sentry gun crate comes down as (like, say, a, um, SAM turret or sentry gun), you can double-tap X to have it turn turn into a different reward. Step 3: Cue the Blackbirds, Chopper Gunners, dogs, etc. Repeat every time you manage a couple of consecutive kills, and you're looking at Step 4: Being a total a-hole.