tough geography there, if that beacon is emitting perhaps it is being blocked by a mountain that the helicopter may be near. so you -- we're very aware that u.s. military families marine corps families may be watching this report and distressed to hear that some of their loved ones are on as missing helicopter but the reality is at this hour the pentagon the u.s. military has declared this helicopter missing. they are searching for it and right now, there are no answers about the fate of this helicopter or those on board. wolf? >> and this helicopter this marine helicopter general hertling you're familiar with it. it's a marine light attack helicopter the hughey uh 1 and as barbara points out, eight people can be on board. you're very familiar with this helicopter. we know there are several hundred military personnel helping in the humanitarian mission in nepal right now, but tell us a little bit more about what they're doing? >> well the uh 1 first of all