"DOD offers comprehensive health care coverage to millions of beneficiaries through TRICARE, a system of health care that DOD purchases from private insurers to supplement the health care that DOD provides through its military and dental treatment facilities (DTF). Purchased dental services are provided through separate programs for different groups of beneficiaries: (1) the ADDP provides dental care to active duty servicemembers who do not have ready access to a DTF; (2) the TDP provides dental insurance to eligible dependents of active duty servicemembers, and to National Guard and Reserve members and their dependents; and (3) the TRDP provides dental insurance to retired uniformed service members and their dependents. DHA is responsible for awarding, administering, and overseeing contracts with private insurers for these programs.Senate Report 112-173, which accompanied the Senate Committee on Armed Services' version of the National Defense Authorization Act for fiscal year 2013, mandated that GAO review DOD's private sector care contracts, including its contracts for dental services. GAO examined (1) how DHA developed the requirements for its current dental services contracts and (2) the reasons for DHA's use of separate contracts for different beneficiary groups. GAO reviewed relevant laws, regulations, and DOD contracts and acquisition"