Eskadrille 721 (721 Squadron) was formed on 1 October 1950, when the Royal Danish Air Force (Flyvevåbnet) was formed by merging the Marinens Flyvevæsen (Danish Naval Air Service) and Hærens Flyvertropper (Danish Army Air Corps), with Eskadrille 721 incorporating the aircraft of the 1st and 2nd Luftflotille of the Naval Air Service, together with the Greenland flight of the Army Air Corps, with the role of transport (including support for operations in Greenland, together with Search and Rescue operations.
The main role for the air wing is to provide tactical transport capacity with its C-130's. The Challengers provide both VIP-transportation for the Royal Court of Denmark and other government officials, and has the option to be equipped with airborne radar for surveillance.
Currently Eskadrille 721 operates:
- Nikolajsen 1970, p.18.
- Augustesen 2015, p. 82.
- Augustesen, Sören. "Denmark's Challengers". Air International, April 2015, Vol. 88, No. 4. pp. 82–85.
- Nikolajsen, O. "Arctic Specialists: History of No.721 Squadron, Royal Danish Air Force". Air Pictorial, January 1970, Vol. 32, No. 1. pp. 16–18.