During an LGBT forum on Wednesday, Army Secretary Eric Fanning expressed skepticism that President-elect Donald Trump would reinstate Don't Ask, Don't Tell.

In 2010, Congress repealed the military policy which prohibited gay, lesbian and bisexual troops from serving openly.

“It is very hard to roll back these things,” said Fanning, the first openly gay Army secretary.

Fanning said that reversal would be difficult because, among other things, “society is changing so quickly.”

“It really is,” he told Steve Clemons, moderator of the Atlantic's “Unfinished Business” summit. “And we're accessing young soldiers who just come from a different world, and they really don't understand why we're discussing some of these [things] or how we're discussing some of these things.”

“It is easier, as difficult as it can be, to implement [regulations] than to roll them back, often times,” Fanning said. “It is one thing to have a debate about whether somebody should be able to put on a uniform. It's an entirely different thing to say to someone who has a uniform on, you've got to take it off. And that is a very different conversation for senior uniformed leadership.”

The Pentagon earlier this year lifted its ban on transgender troops serving openly. That decision has yet to be fully implemented and is seen as more vulnerable to being undone by the next administration.

Trump has at least suggested that he's opposed to LGBT inclusion in the military. When asked in October by a veteran what he would do “about the social engineering and political correctness that's been imposed” on the military, giving transgender service as an example, Trump answered: “We're going to get away from political correctness.”

Fanning steps down from his post on January 19.