 In March 2003, JPAC investigators threw dummies over the edge at those points indicated by the PAVN soldiers while a photographer in a helicopter videotaped their fall.That pointed the investigators to a ledge, below.Several mountaineer-qualified JPAC specialists scaled down the cliffs to the ledge where they recovered leather boots in four different sizes, five survival vests, and other fragments of material that indicated the presence of at least four Americans.