don't ask, don't tell

Definition from Nolo’s Plain-English Law Dictionary

The web of policies, laws, and regulations governing how the U.S. military deals with gay, lesbian, and bisexual service members. Under this policy, the military cannot ask about -- and service members cannot be compelled to reveal -- a service member's sexual orientation. Service members can be discharged if they make statements indicating that they are homosexual or bisexual or indicating that they have engaged in (or intend to engage in) homosexual acts.

Definition provided by Nolo’s Plain-English Law Dictionary.