You will visit this location during many quests. It's a small military base, currently inhabited by ghouls and filled with cannons and laser mines.
In order to gain free access to the terminal on the ground floor, use the password which can be found on the desk on first floor.
Inside the building you will find U. S. Covert Operations Manual magazine.
Camp's warehouse contains large number of ammunition. However, entering requires master level of lock picking - or opening it using the terminal on the second floor inside the barracks. After leaving the building you will be attacked by a powerful robot.
You will find two power armors on the camp's territory: one inside the closed warehouse and another in a container.
The third power armor is located also nearby to the east, inside the abandoned convoy (T-51).