The Northern Army Group (NORTHAG) was a NATO military formation comprising four Western European Army Corps, during the Cold War as part of NATO's forward defence in western Germany.

JHQ Rheindahlen was a military base in Mönchengladbach, North Rhine-Westphalia, Germany active from 1954 to 2013. It functioned as the main headquarters for British forces in Germany and for the NATO Northern Army Group. Latterly it was also known as the Rheindahlen Military Complex, part of Rheindahlen Garrison. It was named after the local village of Rheindahlen, part of the city borough of Mönchengladbach.