US Army Air Assault & General Support Unit Patches VOL 1 Active Duty Units (2001-2021) is a book containing 148 pages of photos and illustrations that detail the various unit patches that have been or are currently in use by Air Assault and General Support Helicopter units in the United States Army since 11 September 2001.This collection was compiled by the author (a retired US Army aviator) and various contributors over the past 20 years. This volume (the 3nd in a series detailing unit patches used by US Army Aviation) will be extremely useful to the historian and collector.