An old slide scan of L-861, 721 Squadron at Vaerloese Air Force Base, 1964/65.
The Danish Catalina's was mainly used for missions on Greenland (search and rescue, ice reconnaissance, aerial photography, etc.), the aircraft was phased out in November 1970.
Only one of Denmark's PBY-5A'ere still exists, in a museum in Norway. 2 PBY-6A were sold to U.S., but both crashed. There are only 2 of the RDAF PBY-6A remaining, L-866 in a museum in England. The other L-861 was for years exhibited at the Danish Technical Museum Elsinore, it is now part of the Air Force exhibition at Denmarks Flymuseum.
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. They operated PBY-5A and PBY 6-A's.
Danish Aviation Museum
Canadian Airline Blog