were recovers from the site of a helicopter crash. it was on an earthquake rescue mission when it went missing. >> reporter: still plenty of daytime flight hours left. crew members sit idle at this american command post at the kathmandu airport. weather conditions near the crash site 21 miles east are getting worse by the minute. if you look here, you can see almost all the american helicopters are grounded right now because they simply can't get to the area. it's too dangerous to fly. on thursday, we flew over the rugged terrain over east kathmandu. we saw villages devastated by the earthquakes. six u.s. marines and two nepal soldiers died in the mountains. >> they were courageous. >> their commander pledging to continue the humanitarian