They were the first african american military aviators in the united states armed forces, they were formally known as the 332nd fighter group and the 99th pursuit squadron, they were called the "redtail angels" by the bomber crews they were assigned to escort and protect, which famous world war ii african-american unit is being described?

The African-American unit you are describing are known as the Tuskegee Airmen.

This group of African-American pilots were critical in the success of the United States during World War II. Over the course of the war, these men completed thousands of missions. These men were extremely successful, as they performed 200 escort missions and never lost a bomber in the process.