Sorry no idea but I saw a thread you put up earlier about camo challenges and having got through the grease gun I can confirm the smg challenges
10 payback medals
50 kills with smg using airborne
50 kills with smg without using airborne
5 double kills
Sorry if this late info
I'm gonna camp in Marvel4's back garden, snoop through his window every now and then and keep an eye out for some early stats.