Military Units

To help readers understand troop strength of the military units discussed in these pages, we offer the following table. The table below list the order of military unit names by troop strength and is based on the definitions of today's U.S. Army units. The names of military units and the number of personnel assigned to those units varies with the point in history and places referenced.

Unit 

Number of Personnel Composition

Commander

Army 

100,000

2 or more corps, headquarters

General

Corps 

30,000 or more

2 or more divisions

Lt. General

Division 

15,000 or more

3 brigades, headquarters, support units

Maj. General

Brigade 

4,500 or more

3 or more regiments, headquarters 

Brig. General

Regiment

1,500 or more 

2 or more battalions, headquarters

Colonel

Battalion 

700 

4 or more companies, headquarters

Lt. Colonel

Company 

175

4 platoons,  headquarters 

Captain

Platoon 

40

4 squads

Lieutenant

Squad 

10

 

Staff Sergeant