Enlisted rank insignia 1920-1942

Arm RankAbbreviationRank
Pvt.Private
Pfc.Private First Class
Cpl.Corporal
Sgt.Sergeant
S/Sgt.Staff Sergeant
T/Sgt.Technical Sergeant
1st SgtFirst Sergeant
M/Sgt.Master Sergeant

Enlisted rank insignia 1942-1948

Arm RankAbbreviationRank
Pvt.Private
Pfc.Private First Class
T/5.Technician Fifth Grade
Cpl.Corporal
T/4.Technician Fourth Grade
Sgt.Sergeant
T/3.Technician Third Grade
S/Sgt.Staff Sergeant
T/Sgt.Technical Sergeant
1st SgtFirst Sergeant
M/Sgt.Master Sergeant

A technician was generally not addressed as such, but rather as the equivalent line (NCO) rank in its pay grade (T/5 as Corporal; T/4 as Sergeant; T/3 as Sergeant or Staff Sergeant). Officially, a technician did not have the authority to give commands or issue orders but could under combat conditions be placed second in command of a squad by a Sergeant. Unofficially, most units treated them as though they were of the equivalent rank of the same pay grade.

Officer rank insignia

Collar RankAbbreviationRank
2LTSecond Lieutenant
1LTFisrt Lieutenant
Cap.Captain
Maj.Major
LTCLieutenant Colonel
Col.Colonel

General rank insignia

Collar RankAbbreviationRank
Bg.Brigadier General
Mg.Major General
Ltg.Lieutenant General
Gen.General
Ga.General of the Army