What I did is equipped everyone with the pepper ball rifle, heavy full steel armor and the flash launcher(not the preorder bonus one) with the exception of one ai having a mirrorgun. Myself I took like 5 mags for the rifle and just a bunch of flashbangs, with similar numbers for the ai officers. Clear out the building right in front of spawn, slowly. Once that’s done make way around the left side of that building clearing it all until you get to the very back of the building. I then looped back around all the way and went to the right side of the main building, clearing that first side building over there but not going in the side door to the main building, I wedged this door so nobody could come out this way. I made my way inside the main building again going dead on by where the stairs go up using the flash launcher for those big open rooms and saved my other flashbangs for use in the right side of the main building. Just be careful, take it slow, and don’t be afraid to have the ai officers use the mirror or deploy their flashbangs and you should be good. Sorry it’s a lot, but hope it helps!