The Pentagon on Thursday confirmed the discharge of an airman for violating “Don't Ask, Don't Tell,” the 1993 law that bars gay and bisexual troops from serving openly, the AP reported.

It is the first firing since President Barack Obama in December signed legislation aimed at repealing the law.

Pentagon officials said the separation occurred on April 29, but refused to elaborate on the details of the case or the airman's gender. The term “airman” can be used for both men and women.

“The airman in the case asked to be separated expeditiously,” Air Force spokesman Lt. Col. Todd Vician said, suggesting the service member outed himself or herself.

The case is also the first since Defense Secretary Robert Gates issued new guidelines making it more difficult for a service member to be booted out of the military for being gay. Prior to October 2010, a DADT-related discharge required only the authorization of a one-star general. The new policy states that only the secretaries of the armed forces can authorize a separation under the law, and the Defense Department's top attorney and Clifford Stanley, the Undersecretary of Defense for Personnel and Readiness, must also be consulted, leaving the policy in the hands of six civilians appointed by the president.

Repeal of the law won't happen until 60 days after the military is certified as prepared for the change. Military officials testifying before Congress have previously suggested that might happened by the end of summer.

Aubrey Sarvis, executive director of Servicemembers Legal Defense Network (SLDN), said the case highlights the need for swift certification.

“Though unfortunate, this discharge highlights the need for certification this month, and in fact, does nothing to diminish our concern that service members remain under investigation and are at risk of being discharged. At SLDN, we have clients facing administrative board hearings right now. Some of these clients have 10 to 18 years of military service and are not looking to be separated under 'Don't Ask, Don't Tell.' In fact, they are fighting these investigations and board proceedings today. It’s critical that certification happen in the month of June,” he said in a statement.