DENVER -- Most remember where we were during the 9/11 attacks in 2001.
But what you might not know is that right after those attacks, 12 members of the U.S. Army's elite Green Berets took on a classified mission in Afghanistan.
That mission is now the subject of a new movie called "12 Strong."
Retired Major Mark Nutsch and retired Chief Warrant Officer Bob Pennington were among those involved.
They said they were part of two teams hand-picked to be inserted into Afghanistan. Their mission: To gather intelligence on the Taliban.
They had to dress the part and even traveled on horseback, which they say helped their mission.