Soldiers are referred to in 2 ways: rank and grade. Rank is the status, such as "Private" or "Captain." Grade, is the pay level that that soldier is entitled to according to the rank. Enlisted soldiers have grades like "E-1," while officers use 'O' grades, "O-3." Warrant officers, (enlisted soldiers with commissioned status, those with technical expertise) use grades like "W-2" and such. Some ranks are grouped in the same pay grade, but pay is usually different depending on the time in service.
5 star Generals are only seen in wartime.
Note the officer ranks 1LT and 2LT, as well as Major and LTC- these are like each other, but one is silver, and the other is gold. When a service member is wearing ACU's/BDU's, the rank is subdued, and hard to see. The rank of Major and Second Lieutenant are sewn gold, even on BDU's. The silver ranks of First Lieutenant and Colonel are sewn black.
This is a long page- it has all the rank for the major branches. Please be patient.
Enlisted
Title
Insignia
Officer
Title
Insignia
Warrant
Officer Title
Insignia
Private
E-1
None
Second Lieutenant
O-1
Warrant Officer One
WO1

Private
(PV2)
E-2
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First Lieutenant
O-2
Chief Warrant Officer 2
CWO2
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Private
First Class
E-3
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Captain
O-3
Chief Warrant Officer 3
CWO3
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Specialist
E-4
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Major
O-4
Chief Warrant Officer 4
CWO4
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Corporal
E-4
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Lieutenant Colonel
O-5
Chief Warrant Officer 5
CWO5
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Sergeant
E-5

Colonel
O-6
Staff
Sergeant
E-6

Brigadier General
O-7
Sergeant
First Class
E-7

Major General
O-8
Master
Sergeant
E-8

Lieutenant General
O-8

First
Sergeant
E-8

General
O-9
Sergeant
Major
E-9

Command
Sergeant Major
E-9

Sergeant
Major of the Army
E-9

Enlisted
Title
Insignia
Officer
Title
Insignia
Airman
Basic
E-1
None
Second Lieutenant
O-1
Airman
E-2
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First Lieutenant
O-2
Airman
First Class
E-3
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Captain
O-3
Senior
Airman
E-4

Major
O-4
Staff
Sergeant
E-5

Lieutenant Colonel
O-5
Technical
Sergeant
E-6

Colonel
O-6
Master
Sergeant
E-7

Brigadier General
O-7
First
Sergeant
E-7

Major General
O-8
Senior
Master Sergeant
E-8

Lieutenant General
O-8

First
Sergeant
E-8

General
O-9
Chief
Master Sergeant
E-9

First
Sergeant
E-9

Command
Chief Master Sgt.
E-9

Chief
Master Sergeant of the Air Force
E-9

Enlisted
Title
Insignia
Officer
Title
Insignia
Warrant
Officer Title
Insignia
Private
E-1
None
Second Lieutenant
O-1
Warrant Officer One
WO1
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Private First Class
E-2
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First Lieutenant
O-2
Chief Warrant Officer 2
CWO2
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Lance Corporal
E-3

Captain
O-3
Chief Warrant Officer 3
CWO3
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Corporal
E-4

Major
O-4
Chief Warrant Officer 4
CWO4
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Sergeant
E-5

Lieutenant Colonel
O-5
Chief Warrant Officer 5
CWO5
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Staff Sergeant
E-6

Colonel
O-6
Gunnery Sergeant
E-7

Brigadier General
O-7
Master Sergeant
E-8

Major General
O-8
First Sergeant
E-8

Lieutenant General
O-8

Master Gunnery Sergeant
E-9

General
O-9
Sergeant Major
E-9

Sergeant Major of the Corps
E-9

Enlisted
Title
Insignia
Worn on
Collar
Officer
Title
Insignia
Warrant
Officer Title
Insignia
Seaman
Recruit
SR
E-1

N/A
Ensign
ENS
O-1

Warrant Officer One
WO1

Seaman
Apprentice
SA
E-2

N/A
Lieutenant
Junior Grade
LTJG
O-2

Chief Warrant Officer 2
CWO2

Seaman
SN
E-3

N/A
Lieutenant
LT
O-3

Chief Warrant Officer 3
CWO3

Petty
Officer Third Class
PO3
E-4


Lieutenant
Commander
LCDR
O-4

Chief Warrant Officer 4
CWO4

Petty
Officer Second Class
PO2
E-5


Commander
CDR
O-5

Chief Warrant Officer 5
CWO5

Petty
Officer First Class
PO1
E-6


Captain
CAPT
O-6

Chief Petty
Officer
CPO
E-7


Rear
Admiral (lower half)
RDML
O-7

Senior
Chief Petty Officer
SCPO
E-8


Rear
Admiral (upper half)
RADM
O-8

Master
Chief Petty Officer
MCPO
E-9


Vice
Admiral
VADM
O-9

Master
Chief Petty Officer of the Navy
MCPON
E-9


Admiral
ADM
O-10
