Not sure about award for becoming an ace, but George E. Laven, Jr. Was a 1st Lt in June or August 1942. He got one kill in Sept. '42 and became a Captain, and by November 1942 (another kill), he became a Major. Two more kills in 1943, and a last one in 1945. By 1947, he was a Lt. Col.
Seems that promotions came with kills, at least early on!
Ed