The challenge you’ll need to complete in order to unlock the CARV 2 is: Using Tactical Rifles, rapidly kill 2 or more players in 10 different matches. Playing Black Ops Cold War is by far the easiest way to complete this challenge. Ideally, you can get into the game and rattle out ten games nice and fast, but if you don't have it, Warzone is an option. If you’re struggling, check out these tips to help you unlock the CARV 2 faster in Black Ops Cold War and Warzone: Like all Cold War gun unlocks, you have to stay in the match until the end. Even if you’re doing the challenge in Plunder, you need to finish the match or your notch won’t count.