WASHINGTON — The Supreme Court today turned down a challenge to the Pentagon policy forbidding gays and lesbians from serving openly in the military, granting an Obama administration request to maintain the Clinton-era "don't ask, don't tell" directive.

The court said it will not hear an appeal from former Army Capt. James Pietrangelo II, who was dismissed under the military's policy.

The federal appeals court in Boston earlier threw out a lawsuit filed by Pietrangelo and 11 other veterans. He was the only member of that group who asked the high court to rule that the policy is unconstitutional. In 1993, President Bill Clinton established the policy as a compromise after strong resistance from the military and Congress toward allowing gays to serve openly in the armed forces.

In court papers, the administration said the appeals court ruled correctly in this case when it found that "don't ask, don't tell" is "rationally related to the government's legitimate interest in military discipline and cohesion."

Pentagon spokesman Bryan Whitman referred requests for comment to the Justice Department, but said the military policy "implements the law."

"The law requires the (Defense) Department to separate from the armed services members who engage in or attempt to engage in homosexual acts; state they are homosexual or bisexual; or marry or attempt to marry a person of the same biological sex," Whitman said in a statement.

During last year's campaign, President Barack Obama indicated he supported the eventual repeal of the policy, but he has made no specific move to do so since taking office in January. Meanwhile, the White House has said it won't stop gays and lesbians from being dismissed from the military.