Lt. Col. Scott Mann is a retired Green Beret in the US Army as well as the president of MannUp Leadership Training. He some people sign up for the military for the wrong reasons. Produced by Eames ...

Follow BI Video: On Twitter More from Military & Defense A triangle pointing right which indicates this type of media can be played. Lt. Col. Scott Mann is a retired Green Beret in the US Army as ...

There are plenty more elite units in the U.S. military.