Desert bighorn sheep establish two desert areas in southwestern Arizona to help preserve the desert bighorn sheep: Cabeza Prieta National Wildlife Refuge and the Kofa National Wildlife Refuge. In 1941, the San Andres National Wildlife Refuge in New Mexico was added. Desert bighorn sheep populations have trended upward since the 1960s when their population was estimated at 6,700-8,100. The upward trend was caused by conservation measures, including habitat preservation. In 1980, desert bighorn sheep populations were estimated at 8,415-9,040. A state-by-state survey was conducted a few years later and estimated the overall US desert bighorn sheep population at 15,980. The 1993 estimate of
Desert Uniforms, Patches, and Insignia of the US Armed Forces patches. Its detailed research is designed to provide a reference for veterans, historians, collectors and reenactors. The March 2017 issue of the Military Trader Magazine stated that, "While the term 'bible' is thrown around rather loosely in our hobby 'definitive' retains its significance as an expression of honor and endorsement. I do not hesitate to say "Desert Uniforms, Patches, and Insignia of the US Armed Forces" by Born and Barns is the "definitive" volume for anyone who is collecting the shortest-lived - but some of the most distinctive - uniforms in U.S. military history. Not only is it a stand