Apparent load shift. Speculation is that the plane had a bunch of military vehicles in it that came loose and slid to the back of the cargo hold and caused the nose-up stall.
I've read 7 or 8 people were on board, all died. I also read most the crew was from Wisconsin... so immediately thought of Austin and Oshkosh... a bunch of military vehicles and crew from Wisconsin? I hope everything is okay with your coworkers Austin. Then again, it's likely the crew is 100% military and just based in WI, which is why they're all from the same place.
Either way... it's a scary and tragic crash. Hard to believe something that massive can just fall out of the sky because a strap broke or something.