Navy Admiral Mike Mullen, the chairman of the Joint Chiefs of Staff, said during an appearance on the CBS talk show Late Show with David Letterman that certification of “Don't Ask, Don't Tell” repeal is close.

Congress approved and President Barack Obama signed into law repeal of the law last December. The policy, enacted in 1993, bars gay and bisexual troops from serving openly.

Top Pentagon officials, including Mullen, and the president must certify that the military is prepared to end the ban before it's lifted.

Mullen told Letterman: “I testified in front of Congress a year ago February that I personally couldn’t reconcile an institution like the military, which values integrity in everything that we do, yet asking people to come to work every single day and lie about who they are. That is how I felt then. That’s how I feel now. The law has been changed. We’re right now in the middle of conducting training prior to certification. Certification will take place … certainly in the next couple of months.” (The video is embedded in the right panel of this page.)

On Monday, Defense Secretary Robert Gates, who'll retire from his post on June 30, told the AP that he doesn't foresee any impediments to repeal, and, if the top officers of each service agree, he's prepared to endorse certification this month.