(Public Domain)JOHNSTON, IOWA—Trenches dug by American soldiers under the instruction of French military officers at Camp Dodge have been found with aerial photographs, historic maps, and geographic information systems technology. Zig-zag trenches that were used at the front of World War I combat areas, and trenches for communications, supplies, and other purposes were located. Artifacts such as ammunition casings, a practice hand grenade, a suppressor for a machine gun, barbed wire, and a glass medicine bottle were also unearthed. “This is a snapshot of time of what we were doing then as a nation. This is our legacy. You have to understand where you have been to know where you are going. This is a piece of where we have been,” Col. Gregory Hapgood Jr., public affairs officer for the Iowa National Guard, told The Des Moines Register.