The retired Nebraska National Guard soldier, who worked with Walz for three years, recounted the disappearance in an interview as a congressional investigation into Walz's China ties continues. ... It was September 1995, and Tim Walz’s Nebraska National Guard unit, the 1-168th Field Artillery, upgraded to the M109A5 self-propelled howitzer. One of its capabilities was firing nuclear artillery shells. Critical SOP manual for nuclear artillery allegedly disappears .. Alpha News has learned from a former National Guard colleague of Walz that, during that time, a classified document allegedly went missing—the Standard Operating Procedure (SOP) manual detailing the howitzer’s nuclear capabilities....