So I decided to do the challanges for the Riot Shield as BO2 is out this week and don't care about my K/D anymore. I managed to do all but Bullet Proof in a couple of hours Mainly on Drop Zone, all the sentry guns and choppers helped no end. Does Bullet Proof also go to 50,000 like Sponge? I've been at it for ages and I'm only on 2860 despie sunning myself in front of sentry guns and under Pave Lows. Also, here's an amusing bit of related gameplay https://www.youtube.com/watch?feature=player_embedded&v=k8r79yJS86E it's on Elite TV so not after likes or anything like that.