It is a lab that contains various medals and rewards that can be obtained by controlling it for a certain period, and there are two battle labs located in the rocky area near the nuclear silo. The medals you can get from the lab include: 

-Medal of Freedom. 
-Medal of bravery
-Medal of Fortitude. 
-Gallantry medal.

You cannot send your units to the lab unless you are a member of an alliance.