When we were doing maneuvers and live fire exercises in 29 Palms, we were instructed not to even cast a shadow on any old unexploded ordinance we encountered out in the field. That was probably Marine bullshit designed to keep us from trying to take "souvenirs," but it worked. I haven't been blowed up once. Unless you count that time that my cousin Stevie talked me into holding a firecracker in my hand and letting it go off. My hand throbbed for days after that one.