The Buddy Team Enlistment Option

The Buddy Team Enlistment Option, also known as the Buddy Program allows a recruit and up to five friends to enlist and train in the Army together.
Under this program, a recruit and his or her friends may enlist in the same Military Occupational Specialty (MOS), and attend Basic Combat Training (BCT) and Advanced Individual Training (AIT) at the same time.

 http://www.goarmy.com/benefits/additional-incentives/buddy-team.html