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Do it on oni alpha site interior. Tactic#1-there are 4 sections in it. 2 are stairs and the other 2 sections are are across from the 2 stairs and have weapons, health, and ammo. 2 people stay on 1 side watching the stairs and the other 2 watch the other stairs. there is a rocket launcher where the aliens come from and a sniper a and shotgun where you camp. take hunters out on site. also applies for brutes with fuel rod cannons and grav. hammers. Tactic #2-camp in an elevator until reinforcements come to get health, ammo, and weapons if you need. if you see hunters do not kill them till the end because they can not fit in the elevator and they block it from enemies coming in. if you see a grav. hammer brute run because it can fit and will throw you over the edge if it gets too close. WARNING- DO NOT USE THE GRAV. HAMMER IN THE ELEVATOR OR YOU WILL THROW YOUR SELF OUT!!!!!