I'd say this picture is from the early 80's. It looks the same as when I was there. I did two tours out at Bldg 200 with NSG as a CT Marine. The vehicles in the parking lot, especially the Suzuki Samurais, which were really popular on Guam are I'd say 80's vintage...Think I see a Camaro in there too!
This picture was taken I believe in the 70's? The special intelligence relay center was located on the top deck of the "terminal bulding" until it moved into the CDAA.
73, Todd KH2TJ