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Caption: "120th Engineer Battalion, 45th Infantry Division, soldier erects a camouflage net over a road exposed to the Communist Forces, Korea. June 7, 1952." Military camouflage is the use of camouflage by a military force to protect personnel and equipment from observation by enemy forces. In practice, this means applying color and materials to military equipment of all kinds, including vehicles, ships, aircraft, gun positions and battledress, either to conceal it from observation (crypsis), or to make it appear as something else (mimicry). The 45th Infantry Division of the United States Army was a major formation of the Oklahoma Army National Guard from 1920 to 1968. In 1951 the division joined the United Nations troops on the front lines during the stalemate of the second half of the war, with constant, low-level fighting and trench warfare against the People's Volunteer Army of China that produced little gain for either side. The division remained on the front lines in such engagements as Old Baldy Hill and Hill Eerie until the end of the war, returning to the U.S. in 1954.