National Guard Depot

The  is a high-security compound, guarded by robots and turrets.

The amount of robots inside can potentially pose a challenge for certain characters, and unless you are equipped properly for the fight it can be quite wasteful on your ammo. Luckily a large supply of Pulse Grenades can be found inside which will make fighting the robots a breeze (however you won't find them until about halfway through, in an ammo box in an office cubicle). The depot is also protected by turrets which can either be destroyed, or you can hack nearby terminals (average difficulty) to disable them, or delete the targeting data resulting in the turrets shooting at everything, including robots and other turrets. There is at least one gas pipe in the beginning that can be used to your benefit tricking robots into the mist and blowing it all up. Furthermore, and somewhat of an annoyance, there are large areas of radiation that covers certain parts of the depot. The sheer amount of loot that can be gathered will require lots of carrying capacity or multiple trips. In addition to a decent amount of weapons and ammo the depot is a good source for various components such as Fission Batteries and  Steam Gauge Assemblies.

Appearances
appears only in Fallout 3.

Location
The National Guard Depot is located at the eastern edge of the map, just on the outskirts of the DC area, north-east of the Friendship Heights Metro Station (DC area: lighter green area in right bottom corner of Pip-Boy map). You will pass the cavern with the Mirelurk King if you strike out from Friendship Heights.

National Guard Armory:

The armory is only accessible after traversing the National Guard Depot, then the National Guard Training Wing, then National Guard Depot Offices, then exiting from the offices to the National Guard Depot. There you will find an electrical switch which opens the utility door to the armory; the switch is on the leftmost wall straight ahead when you exit the Offices.

In the National Guard Armory you will find the Small Guns Vault Boy Bobblehead (which will increase your Small Arms skill permanently by 10) on a shelf next to the terminal for the bunker access. In addition you will find a Minigun, a Missile Launcher, Assault Rifles and lots of ammo and supplies.

The armorys bunker is opened by finding all 5 of the Keller Family Transcripts located throughout the wasteland. Inside the bunker is the Experimental MIRV Fatman.