Final answer:
E.O. 9260 authorized the Legion of Merit in four degrees for award to foreign military personnel beginning 8 September 1939.
Step-by-step explanation:
Executive Order 9260 authorized the Legion of Merit, which is a military award of the United States Armed Forces that is given for exceptionally meritorious conduct in the performance of outstanding services and achievements. The order was signed by President Franklin D. Roosevelt on October 29, 1942. According to E.O. 9260, the Legion of Merit was authorized for award in four degrees to foreign military personnel, beginning 8 September 1939. These degrees are Chief Commander, Commander, Officer, and Legionnaire.