Eagle Squadrons Memorial

This memorial is a Second World War memorial in Grosvenor Square. It commemorates the service of the three Royal Air Force Eagle Squadrons from 1940 to 1942, during the Battle of Britain, and in particular their 244 American and 16 British fighter pilots, of whom 71 were killed. 
These fighter squadrons were mostly manned by US citizens who volunteered to serve before Nazi Germany declared war on the US  in December 1941. At that time US citizens were prohibited from serving in the armed forces of a foreign power, on pain of losing their citizenship. Those affected were pardoned by Congress in 1944.
The Memorial faces a statue of Franklin D. Roosevelt.