I suggest not to use the sniper because this is a CQB situasion so it's not necessary a sniper, but if you or your friend need to boost the scout class I suggest to use M14/M39 with marksman scope or the better M16 (with marksman scope too) because it shoots faster, M14/M39 are much slower between a shot and an other. This can work because the enemies here in Clean Sweep are not so tough and with a M16 they almost die with one shot. Now you can go somewhere and your friend can go somewhere else but not alone. If you are the fireteam leader and your friend is Taylor (soldier number 2), select the third or fourth soldier with Down or Right D-Pad, aim at your friend and give the order to follow (hold RB, then Left, then Up on D-Pad) so an AI soldier will follow your friend and the other one follows you.
I tought that if you split up maybe you can complete the mission faster (gaining more exp). Yeah I'm going to do this with a friend too. That's what I'm doing with a friend and I'm levelling up fast as.
