| 1st Recruit Training Battalion | |
|---|---|
| Active | 1921-present |
| Country | United States |
| Allegiance | United States of America |
| Branch | United States Marine Corps |
| Role | Marine Recruit Training |
| Part of | Recruit Training Regiment |
| Garrison/HQ | Marine Corps Recruit Depot San Diego |
| Nickname(s) | Big Red One |
| Website | Official website |
| Commanders | |
| Current commander | Colonel Peter M. Rummler |
| Ceremonial chief | Drill Master |
The 1st Recruit Training Battalion is a battalion of the United States Marine Corps which is used to train new enlisted personnel. It is composed of four Training Companies; Alpha, Bravo, Charlie, and Delta. The recruit training battalion is responsible for ensuring that each company is following the procedures set forth by the Recruit Training Regiment. Each company is responsible to follow the standards established by the Commandant of the Marine Corps to train, teach, mentor, and above all lead recruits through a demanding standard-based training system. 51 percent of all male Marines attend recruit training at Marine Corps Recruit Depot San Diego (MCRDSD), California."[1]