So I've been trying to rank Ordanace Alert. So I need to destroy 3 Rex Charges down from 10 before the recent patch. So, I rarely run into enemy Rex Charges but in the last few hours when I have I haven't been able to destroy them. I've shot them point blank. Shot them with a grenade launcher and used EMP's on them one right after another. They must be bugged or something. I did manage to get one out of about 6 that I was trying to destroy. OA tiers two and 3 look great. I hope Crytek can look into this. It's been frustrating.