(AP) — A survivalist who feared the world economy was on the verge of collapse faces trial in federal court in Wichita for possession of unregistered destructive devices.

Alfred Dutton,a 67-year-old veteran of both the U.S. Army and U.S. Marines, goes to trial Tuesday for illegally having grenades.

Investigators also found anti-government materials on his computer along with a “manifesto” on how make an ammonium nitrate bomb. Numerous containers of that chemical were found along with fireworks, ammunition, gunpowder and firearms.

The defense contends the prosecution is trying to paint Dutton as a “mad bomber” with plans to take on the U.S. government. His attorney portrays him as a veteran who collected military items and was preparing to sell collectible World War II era hand grenades on eBay.