Ranks in the Army:

E-1 Private(PVT)
E-2 Private 2(PV2)
E-3 Private First Class(PFC)
E-4 Specialist(SPC)
E-4 Corporal(CPL)
E-5 Sergeant(SGT)
E-6 Staff Sergeant(SSG)
E-7 Sergeant First Class(SFC)
E-8 Master Sergeant(MSG)
E-8 First Sergeant(1SG)
E-9 Sergeant Major(SGM)
E-9 Command Sergeant Major(CSM)
E-9(special) Sergeant Major of the Army(SMA)
W-1 Warrant Officer(WO1)
W-2 Chief Warrant Officer 2(CW2)
W-3 Chief Warrant Officer 3(CW3)
W-4 Chief Warrant Officer 4(CW4)
W-5 Chief Warrant Officer 5(CW5)
O-1 Second Lieutenant(2LT)
O-2 First Lieutenant(1LT)
O-3 Captain(CPT)
O-4 Major(MAJ)
O-5 Lieutenant Colonel(LTC)
O-6 Colonel(COL)
O-7 Brigadier General(BG)
O-8 Major General(MG)
O-9 Lieutenant General(LTG)
O-10 General(GEN)
(Special) General of the Army(GA)