Richard T. Hart replaced Robert J. Murphy in May, 1966 as the Monument’s Superintendent. Hart, a native of South Dakota and former teacher, served first as a Park Ranger and later as Park Naturalist at Wind Cave National Park and Jewel Cave National Monument in South Dakota. He was assigned to Yosemite National Park in California as Assistant Park Naturalist in 1960 and to the Mather Training Center in Harpers Ferry, West Virginia as an Instructor (Interpretation) in 1963. In December 1968, Elvin T. Aaberg was appointed Acting Superintendent of the monument. Aaberg, a native of South Dakota, first served as a Park Ranger at Wind Cave National Park in South Dakota and later at Glacier National Park in Montana. In June 1970, Homer A. Robinson was appointed Superintendent. A native of Oregon, Robinson began his career as a Park Ranger at Montezuma Castle National Monument in Arizona in 1959. Successive assignments included Canyon De Chelly National Monument in Arizona; Jewel Cave National Monument in South Dakota; Lake Mead National Recreation Area in Arizona and Nevada; Port Jefferson National Monument and Everglades National Park in Florida. Increased visitation following World War II brought about new problems of protection, public use, interpretation, development and all other phases of park operations. A long range planning program known as MISSION 66 was inaugurated. Improvements to each of the areas were programmed and many completed. Improvements that were completed at Devils Tower included the enlargement of camping facilities, additional housing, improvement of the trail around the Tower, additional water and sewer developments, administration and equipment buildings and the enlargement of the visitor center. CHRONOLOGY OF DEVILS TOWER NATIONAL MONUMENT