they took the dna sample and put it on the other helicopter. so in the event they lost one chopper they still had proof of who they had killed. >> the other guys, other squads were going to come pick us up much we split up from there. the helicopter'sed in even though the pilot thought they could fly it. my boss made the call we were trying to leave it there. blow the whole thing up so no one could have any of them. >> the crashed chopper was blown up with very hot-burning substance that basically will destroy anything in it. it melts the helicopter down because it's a classified military piece of equipment with a lot of interesting electronics inside it. they wanted to make sure they didn't leave anything behind that people could stumble on. >> we blew that up, we got on a helicopter and flew out. that was a bit more intense. now we're there, people know something happened. they know helicopters were involved and now we're trying to