Thomas Nelson Barnes was an airman in the United States Air Force who served as the 4th Chief Master Sergeant of the Air Force from October 1973 to July 1977, the first African American in that position. He was also the first African-American Senior Enlisted Advisor in any of the Armed Forces of the United States. He was key in bringing many African-American related issues to the attention of senior military leaders.

The Chief Master Sergeant of the Air Force is a unique non-commissioned rank in the United States Air Force. The holder of this rank and position of office represents the highest enlisted level of leadership in the Air Force, unless an enlisted airman is serving as the senior enlisted advisor to the chairman. The CMSAF provides direction for the enlisted corps and represents their interests, as appropriate, to the American public, and to those in all levels of government. The CMSAF is appointed by the Air Force chief of staff (AF/CC) and serves as the senior enlisted advisor to the Air Force chief of staff and the secretary of the Air Force on all issues regarding the welfare, readiness, morale, and proper utilization and progress of the enlisted force.