Hearing 1 side of traffic on UHF Guard (243.000) regarding a search for a crashed helicopter identified as CHARGER 77. Cannot make out the callsign of the searching aircraft - perhaps ECHO 92. Searching aircraft is calling for the "crashed" unit on the ground, supposed to be 30 miles south of Greenbrier (KLWB). Is this a drill? Peter Vieth, listening in Roanoke, Va.