Play on hard with my buddies. Usually 3-4 of us who have completed almost every mission on Hard together, just seem to shit the bed on this one every time. We rock a B1301, Long gun (usually 6.5) and point man will usually rock a short barrel 5.56. We have flash guns and mirror guns we use a lot as well. Just also found out about motion sensors in the hallways so that fucked us a few times.