The Defense Enrollment Eligibility Reporting System, or DEERS, is a database used by the U.S. Department of Defense to manage information about military personnel, their family members, and other eligible individuals. It helps ensure that those entitled to benefits, such as healthcare and education, are properly enrolled and can access these services. DEERS is essential for maintaining accurate records and facilitating the delivery of benefits. Individuals must keep their information up to date, including changes in status, such as marriage or divorce, to ensure continued eligibility for programs like TRICARE and other military benefits.