Probably because the patrols are busy elsewhere, courtesy of the other groups. "There. I will key in a special code used for entrance of the facility has been dominated by the enemy, courtesy of our friends at the Battle Lab." The door, painted in the same color as the rock, built under a rocky overhanging, is all but invisible from a distance.

"Anyone wearing blue or white should be incapacitated and captured. The rest, you dispose off any way you can. She uncovers the access panel and keys in the code; the door clicks, then slides inwards most silently, revealing a passage sloping downwards.