20th Space Control Squadron, Detachment 1

20th Space Control Squadron, Detachment 1, operates the Air Force Space Surveillance System, which is comprised of the Alternate Space Control Center and Air Force Fence headquartered in Dahlgren, Va. The Air Force Fence currently consists of three transmitters and six receivers located along the 33rd parallel in the United States. 

The primary mission of the detachment is to operate the ASCC and the AN/FPS-133 surveillance fence radar in support of the squadron's missions to detect, track, and identify objects in near-earth and deep-space orbits and to provide Alternate Space Control Center capabilities for USSTRATCOM. 

The detachment is headquartered in Dahlgren, Va., and the transmitters are located at Gila River, Ariz., Lake Kickapoo, Texas, and Jordan Lake, Ala. Receivers are located at Fort Stewart, Ga., Hawkinsville, Ga.. Silver Lake, Miss., Red River, Ark., Elephant Butte, N.M., and San Diego, Calif.
On Oct. 1, 2004, the Navy Fence and Alternate Space Control Center missions, headquartered in Dahlgren, were officially transferred to the Air Force under the 20th Space Control Squadron as Detachment 1. Detachment 1 consists of 11 active-duty military, 41 DoD civilians and five contractors at Dahlgren, and 102 contractors at nine field sites. The ASCC functions as the alternate to the Joint Space Operations Center Space Situational Awareness Operations Cell and provides freedom of action in space for the United States and its allies by performing space situation awareness and space surveillance under USSTRATCOM's space control mission. The ASCC processes all manmade and environmental threat activities against United States/allied satellites and ground stations.
Additionally, the ASCC provides accurate positional data on all manmade, earth-orbiting space objects by effectively directing the Space Surveillance Network, providing in-depth orbital analysis on these space objects, and efficiently disseminating orbital positional data to customers worldwide.
Det. 1 is continuously improving their capabilities and is currently performing critical upgrades that will provide them and the SSN a new orbital tool to keep pace with the latest technological advances.
The Navy Fence was one of the military's first tracking assets, and the use of its technology was instrumental in the development of our current array of space surveillance sensors. In the 1950s, the Naval Research Lab formulated a space surveillance test program that used a United States Army ground-based transmitter at Fort Monmouth, N.J. to bounce signals off orbiting satellites, and tracking stations to receive the signals. This pioneering tracking system led to the concept of tracking satellites by reflecting signals off them. Following a successful demonstration of the experimental system in 1958, NRL immediately began construction of the world's first system capable of detecting satellites in orbit around the Earth. By 1959, a network of antenna sites stretching across the southern United States from Georgia to California was operational around the clock. Signals recorded at the sites as space objects passed through the high-energy radar were transmitted to the former Naval Ordnance Laboratory at Dahlgren. There, some of DoD's largest computers of that time calculated orbit predictions.
The utility of the space surveillance concept was proven on Feb. 11, 1960, when the capsule of Discoverer 8, which had been lost during a de-orbit attempt the previous year, was detected and identified. In November 1960, the Joint Chiefs of Staff placed the Navy's space surveillance sensor under the operational control of the North American Aerospace Defense Command to serve as an integral component of NORAD's space detection and tracking system.
The Fence can detect basketball-sized objects in orbit around the Earth out to an effective range of 15,000 nautical miles. Once the object's location and general direction of movement are determined, Fence operators notify JSpOC, which can then direct a tracking radar to make a more precise determination of the object's characteristics. More than 5 million satellite detections, or observations, are collected by the Fence each month.
As we progress in our space capabilities, the Air Force Fence and Alternate Space Control Center missions will continue to play a prominent role in providing space situational awareness to our warfighters across the globe.