Date: circa 1961 the ranking noncommissioned officer in the air force serving as adviser to the chief of staff
CHIEF MASTER SERGEANT OF THE AIR FORCE
Meaning of CHIEF MASTER SERGEANT OF THE AIR FORCE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012