A training hand grenade found in a World War I training trench is seen at the Iowa National Guard Base at Camp Dodge, Wednesday, May 28, 2014, in Johnston, Iowa. Excavation is underway at the camp as part of an archaeological dig to learn more about trench complexes built for training soldiers in World War I. Camp Dodge, originally established in 1909, was one of 16 U.S. Army installations across the country to be transformed for training from 1917 to 1919. (AP Photo/Charlie Neibergall)
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