The "E" in E-1 stands for "enlisted" even though the "one" suggests the paygrade for that placement. The opposite pay out classes are "W" for warrant officers and "O" for commissioned officers. Some enlisted paygrades have two ranks. The Army, such as, has the ranks of corporal and expert at https://alexiskhcwq.laowaiblog.com/26545091/a-secret-weapon-for-chrome-car-emblems