 Complete the following phrase:  Flying the Republic P-47 Thunderbolt, the 56th Fighter Group was the most successful of the Eighth Air Force groups in air-to-air combat, and the second most successful in the USAAF with 665.5 the 354th FG had 701 while the Pacific-based 49th FG had 664. It engaged in counter-air and interdictory missions during the 