In today's Air Force, the term sergeant refers to all Air Force non-commissioned officers up to the rank of senior master sergeant (E-8). An Airman who has achieved the rank of senior master sergeant (E-8) may also be referred to as "senior". An airman who has achieved the rank of chief master sergeant (E-9) is referred to as "chief". Those in the grade of staff sergeant (E-5) and technical sergeant (E-6) are referred to as non-commissioned officers, while those in the grade of master sergeant (E-7) through chief master sergeant (E-9) are referred to as senior non-commissioned officers.
