| Allan's Island Radar Station | |
| Partof: | United States General Surveillance Radar |
| Location: | Newfoundland |
| Ensign: | File:US Army Air Corps Hap Arnold Wings.svg |
| Type: | Radar Station |
| Code: | Cinco |
| Built: | 1942 |
| Builder: | United States Army |
| Used: | 1943–1945 |
| Controlledby: | Newfoundland Base Command |
| Garrison: | 685th Air Warning Company |
Allan's Island Radar Station (Cinco) was a United States Army General Surveillance Ground Radar Early Warning Station in the Dominion of Newfoundland.[1] 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.[2] It was located on Allan’s Island 250km (160miles) southwest of St. John's.[3] It was closed in 1945.
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.[1] 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.[4]
It operated an SCR-270 manned Early-warning radar.[5]
Units:
Inactivated November 1944
Assignments: