I am the grandson of Pvt William Clint (Pvt William Klint ) the stories he told me are that there where numerous German military advisors visible from the border. A few days before they had stopped someone crossing with $100k cash and confiscated it. 
 He told me that while trying to stop someone from escaping back into Mexico the customs agent and another soldier where shot first and while he returned fire he was shot seven times. He couldn't open the fingers on his left hand they where closed in a fist but his thumb worked, the bullet that entered his face went into his neck and stayed there until worked  it's way closer surface and was removed in the 1940s. So the person that called this a hoax is an idiot.