I think this mission may be impossible. The problem is the patrol with the officer and the 4 riflemen. They come straight toward where the player spawns and it's impossible to kill them without dying or setting off the alarm and there's no where to run and hide before they show up. In all the videos I've watched they don't come to the spawn.
Edited by ArcticPrism, 22 December 2016 - 05:26 AM.