It wasn't hard at all for the guys to properly shut the soldier up. Within seconds and a few wraps of duct tape later, all the sound that SPC Jahnke could really make had been reduced to a light moan.
PERFECT! Just how the guys wanted it. The guys then started looking through the monitors, computer, and everything in the control room to grab what they need, and to remove anything that will hinder what they're trying to do.
They were so absorbed in what they're doing that they didn't realize that there a soldier walking from the parking lot towards the room, he's still pretty far, and because of how bright the outside is, the soldier suspected nothing wrong is going on inside the room.