En el US army grados y abreviaturas:
ENLISTED:
Private E-1 (PV1) (no insignia)
Private E-2 (PV2)
Private First Class (PFC)
Corporal (CPL) ---- Specialist 4 (SP4)
Sergeant (SGT) ---- Specialist 5 (SP5)
Staff Sergeant (SSG) ---- Specialist 6 (SP6)
Platoon Sergeant (PSG) o Sergeant First Class (SFC)
First Sergeant (1SG) ---- Master Sergeant (MSG)
Command Sergeant Major (CSM) ---- sergeant Major (SGM)
Sergeant Major of the Army (SMA)
WARRANT:
Warrant Officer W-1 (WO1)
Chief Warrant Officer W-2 (CW2)
Chief Warrant Officer W-3 (CW3)
Chief Warrant Officer W-4 (CW4)
COMMISIONED:
Second Liutenant (2LT)
First Liutenant (1LT)
Captain (CPT)
Major (MAJ)
Lieutenant Colonel (LTC)
Colonel (COL)
Brigadier General (BG)
Major General (MG)
Lieutenant General (LTG)
General (GEN)
General of the Army (GA)
Lo mas interesante es que en USA todas las fuerzas, Army, Navy, Marines, air Force y Coast Guard usan en general los mismos distintivos en los grados equivalentes, lo que facilita su comprensión.
En los oficiales es exactamente igual entre las distintas fuerzas, ya sea, las barras, hojas de roble, águila o cantidad de estrellas.
Saludos