De Kooy Airfield / Den Helder Naval Air Station — Den Helder, Netherlands

De Kooy Airfield, coded DHR, is located near Den Helder in the Netherlands and operates as a joint civil-military facility, home to the Royal Netherlands Navy's helicopter operations as Den Helder Naval Air Station. Den Helder itself is a significant naval town, serving as the main base for the Royal Netherlands Navy, and the airfield supports naval helicopter squadrons involved in maritime patrol, search and rescue, and offshore support missions in the North Sea. Civilian use of DHR is limited, primarily involving general aviation and occasional charter flights connecting to offshore oil and gas platforms or the Wadden Islands. The airfield's dual military-civilian character makes it distinct from typical Dutch regional airports.