To become a Chief Master Sergeant in the United States Air Force (USAF), you must first join the service as an enlisted airman. To become an enlisted airman, you must be over 17 and not older than 42.

The U.S. Air Force has selected 5,166 technical sergeants for promotion to master sergeant. The overall selection rate was 25.61 percent, with an average selectee overall score of 523.22.

The Air Force Chief Evaluation Board has selected 472 senior master sergeants for promotion to chief master sergeant out of 2,142 eligible for a selection rate of 22.04 percent. The chief master ...