You need to OPERATE this up OPERATIONALLY as if you were an OPERATOR or you're done for; whoever is in here is tough, smart and/or fast enough to take out a random sec guard just walking down the street without anyone noticing or if someone did notice taking them out fast and silently enough not to alert anyone else.
"Guys, we need to work this really carefully. Sarge, can I take over?" you mumble into your mike. Sarge just gives you a sideways look out of his gasmask and a nod. He knows he isn't the spryest anymore.
"Jenkins, Fitz, Sarge, you stay back and cover me while I go check out the guardhouse. Stick up a smoke or something, try to look inconspicious. Sarge, radio around for anything in the vicinity and give HQ a heads-up about the situation Ben, you're on point. Alex, on me."
"Oh, you'd like me on you, wouldn't you?" she sasses you right back, her usual wolfish grin concealed by the mask. Alex just strolls past you two shaking his head.