Constructed in the spring of 1943 at Lewistown Airfield, this building was designed to train United States Army Air Force field maintenance crews in camouflage painting and to facilitate aircraft camouflage techniques intended to make aircraft difficult to distinguish from the ground. A catwalk, unique among the airfield’s buildings, let students lay out designs while giving instructors a bird’s eye view for evaluation. Although American allies used elaborate camouflage, United States Army Air Force heavy bombers never widely adopted it. The building more often served as an auxiliary hangar for base utility aircraft shuttles carrying payroll and mail between Lewistown and the main base at Great Falls, and it may also have housed the small twin engine AT-6 tug used in target practice, towing a windsock-like target over the gunnery range north of Grass Range while B-17 gunners fired painted, color-coded bullets so the instructor could determine who hit the target. Vintage pinup posters and calendars on the main walls recall the years of its active use.