In this 1917 or 1918 postcard provided by the Iowa Gold Star Military Museum, soldiers walk through trenches while training at Camp Dodge in Johnston, Iowa. Excavation is underway at the camp as part of an archaeological dig to learn more about the World War I trench complexes built for training soldiers. During World War I about 120,000 soldiers trained at Camp Dodge. (AP Photo/Iowa Gold Star Military Museum)
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