Back in the mid 80s I was hunting quail on White Sands Missile Range and found a 50 caliber case, looked around and found another about 40-50 feet further, then another about the same distance on, etc. all in all about 15 cases or so. I could almost hear the fighter on it's training mission. Most were stuck in the caliche or filled with it. 1943 head stamps on all of them.