Battalion is the basic tactical unit of the US Army, which mainly includes tank battalion, machine step battalion, light infantry battalion and infantry battalion.

The tank battalion is mainly composed of armored divisions and mechanized infantry divisions, with four tank companies and 552 personnel.

Mechanized infantry battalion is mainly composed of mechanized infantry division and armored division. It has four mechanized infantry companies and 1 anti-armored company, with 826 personnel.

The light infantry battalion is mainly organized in the light infantry division, with three light infantry companies and 559 personnel.

The infantry battalion is mainly composed of airborne division and air assault division, and has three infantry companies, 1 anti-armored company, with 697 personnel.