3rd Infantry Battalion 1st Marine Raider Regiment

The 3rd Infantry Battalion "Columbia Guards" (3/1) is a battalion in the 1st Marine Raider Regiment consisting of three companies, a weapons company and a headquarters and service company. The 1st Battalion primarily recruits from Maryland, Delaware, and the District of Columbia.

Subordinate Units
Company G

Company H

Company I

Weapons Company

Headquarters and Service Company