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During World War II, over 40,000 pilots were trained at the Pocatello Army Air Base and many flew day and night training missions over the Arco High Altitude Bombing Range (AHABR) and the Twin Buttes Bombing Range (TBBR). Army to use lands adjacent to the Arco NPG for two aerial bombing ranges. In addition to naval ordnance testing, the U.S. The guns then returned to action the way they had come and entered battle once more. Finally, the guns were sent to the Arco NPG to be test-fired and scored for accuracy. After repeated combat firing wore down the rifling, the guns were taken to coastal ports, unloaded, and sent by rail overland to Pocatello, Idaho, where they were refurbished and relined. The Arco NPG was the terminus of an elaborate logistical system that began with the guns on ships like USS Missouri and USS Wisconsin. The Arco NPG was the only proving ground of its kind west of the Mississippi River and is one of very few sites in Idaho that contributed to American victory during World War II. Significance: The Arco Naval Proving Ground (NPG) was one of five specialized ordnance facilities established in the United States during World War II to support ordnance testing and research and experiments related to safe storage and transportation of live ordnance. Office of Scientific Research and Development Underwater Explosives Research Laboratory Historic American Landscapes Survey, creator Idaho National Engineering Laboratory, Arco Naval Proving Ground, Scoville, Butte County, ID