The purpose of Re-enlistment bonuses are to encourage soldiers to re-enlist in MOSs (jobs) that are considered to be "short" by the Army.
At present, there are three basic types of Army Re-enlistment Bonuses. The "regular" Army Selective Re-Enlistment Bonus Program targets soldiers who hold a shortage MOS and agree to re-enlist in that MOS. The BEAR Program encourages soldiers in overmanned MOS's to re-train into shortage MOS's, then re-enlist within that new MOS for a monetary bonus. The Deployed Re-Enlistment Bonus allows a soldier with almost any MOS to re-enlist while in a designated deployed location (usually a combat zone such as Afghanistan or Iraq) and receive a monetary bonus.

