In this photo provided by NBCUniversal, Timothy Michael Poe appears on "America's Got Talent," on the episode that aired Monday, June 4, 2012. Poe, who claimed he was injured during a grenade blast in... more 

In this photo provided by NBCUniversal, Timothy Michael Poe appears on "America's Got Talent," on the episode that aired Monday, June 4, 2012. Poe, who claimed he was injured during a grenade blast in Afghanistan, has no military record of his purported combat injuries, the Minnesota National Guard said Tuesday, June 5, 2012. (AP Photo/NBC, Virginia Sherwood) less