Noun
a senior noncommissioned officer in the Air Force with a rank comparable to master sergeant in the Army
Source: WordNetHe joined the United States Air Force where he served for over 20 years and attained the rank of Senior Master Sergeant prior to retiring in 1975. Source: Internet
James joined the U.S. Air Force in 1964 and after 28 years of service, he retired as a Senior Master Sergeant in 1992. Source: Internet