length. >> reporter: make it through, and the result is obvious. >> it's a self-contained unit that can go anyplace in the world and literally do nothing but kick ass. >> reporter: they may be supermen, but they are men. and mortal. last august 22 team 6 members were killed when their chinook helicopter was shot down in a firefight in afghanistan. but success or failure, these men stay in the shadows, remaining silent as we mourn or as we applaud. thankfully, they are on our side. i've been with some of these men from s.e.a.l. team 6. and to see them in person really doesn't do them justice because it's not just their physical appearance. it's not their might. it's not even their skills. what makes them different is their dedication. they literally surrender everything. sometimes even their own lives. to carry out missions for our country. chris cuomo, abc news, new york. >> i don't think superhuman is an understatement. >> to give you an idea of how dangerous that mission was, i believe that's the first time that american troops in any form