Keep Our Promise to America's Military Retirees Act

Keep Our Promise to America's Military Retirees Act - Includes as an employee, for purposes of Federal provisions authorizing enrollment under the Federal Employees Health Benefits (FEHB) Program: (1) a member of the armed forces who began service before June 7, 1956, and retired after a minimum of 20 years of such service or by reason of a service-connected disability; and (2) the surviving widow or widower of such member.

Directs the Secretary of Defense to enter into an agreement with the Office of Personnel Management to provide FEHB coverage to the following eligible beneficiaries: (1) a member or former member entitled to military retired or retainer pay; (2) an unremarried former spouse who was married to a member for at least 20 years, during which such member performed at least 20 years of retirement-creditable military service; (3) a dependent of a deceased qualifying member or former member; (4) a dependent of a living member or former member; and (5) a family member of such member.

Repeals a provision prohibiting coverage under the Civilian Health and Medical Program of the Uniformed Services for persons entitled to hospital insurance benefits under part A of title XVIII (Medicare) of the Social Act.