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
The officer grades are all 
one... [DOC] [TLE] Military Pay Chart & US Navy Pay Grades : Navy.com [PAR] Learn more about the salaries & military pay grades available for Officers, 
Enlisted Sailors and Reservists in America's Navy in the military pay chart.