He describes how the Green Berets and the US Navy SEALs are different. Some of the differences may surprise you. Produced by Eames Yates Follow BI Video: On Twitter More from Military & Defense Lt.

These films do a wonderful job of capturing the lethal nature of one of the United States' most elite military units.

The Navy SEALs have their share of tragedies, too. In the invasion of Grenada in 1983, four US Navy SEALs died after ... predecessors faced the biggest military challenges that the times threw ...