Those nasty machines assaulted the building and seems there are no survivors among the personnel. Destroy all robots you meet on your way, and collect all coins and bonuses you reach. Restore health and proceed further.
You are a trained soldier and the government you work for, summon you only in the most complex cases. This mission is exactly that kind of case. Enter the building and kill all robots that went mad. Pick up a rifle and shoot all hostile robots in the area, but don't forget to collect bonuses and health kits to restore your health.