ArcJet Systems

 is a location in the Commonwealth.

Background
ArcJet was a contractor specializing in the design and development of custom-built high-tech aviation equipment. This particular facility included offices and labs for their staff, as well as a secure test chamber for new products in development. It has largely been abandoned since the war. Its security system, including turrets and Protectrons, was more than enough to fend off any Raiders.

Layout
The area contains a Weapons workbench and an Armor workbench

Arcjet Systems
The outer facility can be freely explored prior to Call to Arms and contains a variety of loot. The path from the entrance to the Engine Core access is largely linear, though there are goodies hidden away in every nook and cranny.

Arcjet Engine Core
The Engine Core is built around the central testing shaft, containing a fueled jet engine. It is accessed during Call to Arms and is a much, simpler, straightforward path. The bottom level is accessed using the stairwell, with the primary means of accessing the control room being the elevator. To power the elevator, the player has to enter the maintenance room at the bottom (containing a Junk Jet) and use the terminal in the back to power up the facility and the engine.

At this point, synths attack Paladin Danse en masse. The easiest way to get rid of them all is to activate the engine test. It will cook all synths and just smoke Danse a little bit, thanks to his armor. Afterwards, a short trip using the elevator brings the player and the Paladin to the control room with more synths. One of them carries a component crucial for contacting the Brotherhood and boosting the antenna's gain.

Afterwards, it's just a simple matter of exiting the facility using the maintenance elevator.

Notable loot

 * The "Will Robots Rule the World?" issue of Tesla Science: On the 2nd level, next to the CEO's terminal
 * Mini Nuke
 * Junk Jet: technician's room
 * Technician's personal log: technician's room
 * Discarded ArcJet worklog: laboratory control room; on the central googie desk next to the Lab Control Terminal in the middle of the room.

Appearances
appears only in Fallout 4.