Successfully knock out or kill the engineer without alerting Presper and his men

Successfully knock out or kill the engineer without alerting Presper and his men was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is located in B.O.M.B.-001.

Quick walkthrough
Doing this will allow the PC to steal the engineer's NCR garb, including helmet and shades, put them on, and more easily infiltrate the Command Control Room unmolested (Deception > 60).

Quick walkthrough
If the player has successfully sneaked past the security bots on the central hub, which in turn does not set off the internal alarms, then the player can try to sneak up on the engineer who is busy fiddling with a computer on the southwest side of the Engineering room. The PC must attack with a quiet weapon (unarmed or un-powered melee) and successfully subdue the engineer before he has a chance to run to the alarm on the opposite wall. The best way to do this is a successful critical hit to the head or eyes. A successful critical will instantly send the engineer to the floor, where the PC may easily finish him off. A hit to the head or eyes that does not cause a critical will cause the engineer to turn around and fight back with a pipe wrench for two rounds before running to the alarm, screaming like a nancy the whole way. If he makes it to the alarm, Coleridge and his boys will storm in, guns a blazing.