official homepage: http://www.heidelberg.army.mil/
After World War II, Heidelberg was one of a few major cities in Germany not significantly damaged by Allied bombing. Situated in the American zone of Germany, Heidelberg became the headquarters of the American forces in Europe. Several military installations remain, especially Campbell Barracks (former Wehrmacht Großdeutschland-Kaserne) which is where headquarters for several units are located. including United States Army, Europe (HQ USAREUR) and NATO's Allied Land Forces, Central Europe (LANDCENT). Campbell Barracks, Mark Twain Village are both in Südstadt; Patton Barracks are in nearby Kirchheim; and USAREUR MEDDAC Headquarters (also known as Nachrichten Kaserne) is in Rohrbach. There is also a gated housing community, Patrick Henry Village, located west of Kirchheim. These make up the U.S. Army Garrison Heidelberg. Additionally, a small number of NATO facilities are present on the installations, most notably HQ Allied Land Component Command, Heidelberg (CC-Land Heidelberg). An old U.S. Army Air Field is still present; However, only UH-60 Black Hawks and AH-64 Apache Helicopters continue to use it.
(source:http://en.wikipedia.org/wiki/Heidelberg)