> “Our best day is their worst day,” said Bernard Theisen, a senior GVSC engineer, “because we’re going to go in assuming no comms, potentially no GPS, and the terrain that was there yesterday may not be there today.” A dirt road may be washed out by flooding in a disaster relief operation, for example, or cratered by roadside bombs in a war zone. And that’s assuming there ever was a road to where you need to go, never a safe assumption.