According to the book Inside Delta Force by Command Sergeant Major Eric L. Haney (ret.), the smallest unit is a team, consisting of four to five members. Each team specializes in HALO/HAHO, SCUBA, or other skill groups. The next tier is the troop level, consisting of four to five teams. Squadron level (there are three squadrons) consists of two troops (Short gun-assault and Long gun-sniper) which are broken down into troops and teams as needed to fit mission requirements.
In Not a Good Day to Die: The Untold Story of Operation Anaconda, Army Times staff writer Sean Naylor describes Delta as having nearly 1,000 operators. Naylor wrote that approximately 250 of those are operators trained to conduct direct action and reconnaissance missions. Those soldiers are divided into three squadrons—A, B, and C—with each squadron subdivided into three troops. Two are assault troops while a third troop specializes in reconnaissance and surveillance and is known as the “recce” troop. The remaining soldiers in Delta are highly trained specialists in mechanics, communications, intelligence, and other support activities, on top of a headquarters staff.
Naylor also wrote that Delta maintains an aviation platoon using aircraft painted in civilian schemes and with fake identification numbers, different from the aircraft of the 160th Special Operations Aviation Regiment (Airborne). This aviation platoon allegedly uses as many as twelve AH-6 and MH-6 Little Birds. A Defense Department Web site also refers to an award given to the Aviation Squadron HQ, 1st Special Forces Operational Detachment-DELTA (Airborne).