As one of these enlisted ranks in the army, your grade is E-1 or E-2; as a first class one, it's E-3
[DOC] [TLE] Enlisted Air Force Ranks | Military.com [PAR] Enlisted Air Force ranks are broken down into three levels: Airmen (E-1 ... of the 
U.S. military where NCO status is achieved at the grade of E-5.