The complex is operated by the United States Army Intelligence and Security Command (INSCOM) on behalf of the U.S. National Security Agency (NSA). Building 4373 within the complex houses the NSA's European Cryptologic Center (ECC), the agency's principal SIGINT processing, analysis and reporting center in Germany.
In 2015, the Peng Collective operated a airborne leaflet strike over the facility as part of their Intelexit program, to call the employees to quit their job in case of ethical or psychological distress. Shortly after the drop of the leaflets, the association's website was blocked on computers within the complex.
- Colorado Cryptologic Center
- Georgia Cryptologic Center
- Hawaii Cryptologic Center
- Texas Cryptologic Center
- Christian Fuchs; John Goetz; Frederik Obermaier; Bastian Obermayer & Tanjev Schultz. "Frankfurt: An American Military-Intel Metropolis". Süddeutsche Zeitung. Retrieved 21 December 2013.
- Waid, Matthew (July 22, 2013). "The European Cryptologic Center at Darmstadt, Germany". Retrieved July 15, 2015.
- Charlie Coon (2003-10-07). "66th MIG assets to begin moving to Darmstadt". The Stars and Stripes. Retrieved 2013-07-14.
- "News Release HQ U.S. ARMY EUROPE & 7TH ARMY - Standortschließungen in Darmstadt und Hanau" (PDF; 416 kB). Office of the Chief of Public Affairs, Heidelberg. 2007-07-11. Retrieved 2013-07-14.
- Wiesel, Karl (September 26, 2008). "Wiesbaden: Upgrades, new facilities transforming garrison". United States Army. Retrieved July 15, 2014.
- The Intercept article "Drone Flies Over NSA Complex in Germany, Dropping Leaflets"
- "Spiegel Online, Protestaktion bei Darmstadt: Drohne wirft Flugblätter über NSA-Komplex ab".
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