[1] Receiving the Defense Secretary's approval on 21 July, the Air Force directed the Corps of Engineers to proceed with construction of what became the network of Semi Automatic Ground Environment (SAGE) sites.

However, the 781st Aircraft Control and Warning Squadron (AC&W Sq) began operations with AN/FPS-3 and AN/CPS-4 radars at the site in April 1952.

As a GCI station, the squadron's role was to guide interceptor aircraft toward unidentified intruders picked up on the unit's radar scopes.

In fact, of all of the radars in the SAGE system, gap-filler or long-range, the Saugatuck annex appears to be the last site in public hands that is nearly completely intact with all of the electronic equipment still in place in both the building and tower.

DC-06 with its AN/FSQ-7 computer remained under the 34th AD until it was inactivated on 30 September 1969 when technology advances allowed the Air Force to shut down many SAGE Data Centers.

The blockhouse stores paper archives, but still retains the original elevator and large map display with rolling ladder on a secret floor.

This article incorporates public domain material from the Air Force Historical Research Agency