Natrona County High School was originally known as Casper High School. The current building was constructed between 1924 and 1941 in Collegiate Gothic style. It was partially built under the authority of the Works Progress Administration; the crest of the WPA is visible in the sidewalks on the front campus. In exchange for federal assistance, male student participation in the Junior Reserve Officers' Training Corps was mandatory until a few years after Kelly Walsh High School opened in 1965. The JROTC at NCHS is the second oldest unit in the nation and celebrated its 100th anniversary in 2014.