Waldorf is home of the Air Force Ground Entry Point System (GEP). See GEP System Description Page . Much of this site appears above ground, which seem unusual for it's defense related role (the nearby Potomac may be the reason). The Waldorf site also have a very small footprint (less than 2 acres). Recent reports indicated the facility is nearly empty. The site is/was the headquarters of the Southern Maryland Operations (SMO) center. SMO was a key player in the Long Lines, as well as the fallback facility for the DC area.

This location is the hub for one of AT&T;'s least-well known telecommunications services, the US Air Force's wideband ground entry system, known as Combat Ciders. This and a similar system known as Presidential provide secure multi-line air to ground connectivity for the NEACAP, Looking Glass, and other airborne nuclear command posts and Air Force One and other VIP aircraft to ensure communications for the National Command Authorities. Note the vertical antennas atop the tower. Resembling UHF television transmitting antennas, they provide high-power and high gain, enabling each such site to cover an area of the US exceeding 200 miles in diameter.