Allan's Island Radar Station

Allan's Island Radar Station (Cinco) was a United States Army General Surveillance Ground Radar Early Warning Station in the Dominion of Newfoundland. It was built during World War II and responsible for monitoring air traffic from Naval Station Argentia to Gander and into the Gulf of St. Lawrence. It was located on Allan’s Island 250 km southwest of St. John's. It was closed in 1945.

History
The site was established in 1942 as a United States Ground Radar Early Warning Station, funded by the United States Army, which stationed the 685th Air Warning Squadron on the site under operational control of Newfoundland Base Command at Pepperrell Air Force Base. The station was assigned to Royal Canadian Air Force in November 1944, and was given designation "No 40 RU". The RCAF operated the station until November 1, 1945.

It operated an SCR-270 manned Early-warning radar.

United States Army Air Forces units and assignments
Units:
 * 685th Air Warning Squadron, 1943
 * Inactivated November 1944

Assignments:
 * Newfoundland Base Command, Winter 1943