Unified Combined Military Boot Camp, or UCMB, is the initial recruit training to which new UNSC recruits are sent following enlistment. Its name suggests that recruits from all four UNSC service branches, Army, Navy, Air Force and Marine Corps, attend UCMB. Following graduation from UCMB a recruit may be required to complete additional training; for example, UNSC Navy recruits require six additional weeks of vacuum and microgravity training.