A chief master sergeant is the military rank for a senior non-commissioned officer in the armed forces of some countries.

Above the rank is that of first chief master sergeant, also created in 2004 and bestowed on the most veteran non-commissioned officer who has served in the aforementioned service branches.

Chief master sergeant (abbreviated as CMSgt) is the ninth, and highest, enlisted rank in the United States Air Force and the United States Space Force, just above senior master sergeant, and is a senior non-commissioned officer rank.

This positional billet is held by a chief master sergeant and is denoted on the rank insignia by a lozenge (known colloquially as a "diamond").

Additionally, they recommend or initiate actions to improve organizational effectiveness and efficiency as well as ensure that the management of personnel and resources are consistent with current practices and procedures in support of a wing's mission.

The WWM is a (Chief Enlisted Manager code 2W100)[clarification needed] command master sergeant assigned directly to the MXG/CC.

[clarification needed] Weapons activities required to support the generation of peacetime training sorties generally do not reinforce primary combat skills.

The WWM is charged with providing technical and managerial advice to senior leaders in matters of weapons loading and armament systems.

[clarification needed] CCMs provide leadership to the enlisted force and are the functional managers for group superintendents and first sergeants in their organizations.

[7][8] Although the Air Force had been an independent service since 1947, the rank of chief master sergeant did not come into being until the authorization of the Military Pay Act of 1958.

The original chief master sergeant rank insignia, used from 1958 to 1994, consisted of two chevrons on top, three stripes in the middle, and three rockers on the bottom.