Which squadron was the first to receive recognition for leading bombers against Japan?

The 99th Fighter Squadron was the first African American fighter squadron to see combat during World War II and is best known for their missions, including those involving bombers against Japan. This squadron was emblematic of the contributions of African American service members during the war and broke barriers regarding racial segregation in the U.S. military. Their role in various operations not only showcased their capabilities but also led to broader recognition of their service, which played a part in changing attitudes toward equality within the military.

In contrast, the other choices either represent different types of units or were involved in varying capacities. The 1st Air Commando Group was more engaged in specialized missions, often focused on unconventional warfare; the Fifth Air Force was a major command responsible for air operations in the Pacific but did not originate the recognition for leading bombers; and the Thunderbirds is primarily known as a demonstration squadron associated with showcasing aerial acrobatics and military precision rather than direct combat missions.