Major revisions in the curriculum, which began in the 1950s, continue through the 1960s, driven by accreditation expectations, the changing needs of the mineral industries, and student demographics. The course load for the Engineer of Mines (E.M.) degree, which now typically takes 5 years to complete, becomes increasingly unwieldy; additions of humanities requirements add to the load. The university finally discontinues the E.M. in favor of the 4-year Bachelor of Science degree. (The E.M. as Mines first degree holds strong ties with alumni and School identity and tradition.) During this decade Mines begins the transition to a residential institution, constructing on-campus housing, including married student housing. This is also the decade that enrollment of women increases significantly, resulting in a (relatively) major cultural shift. Concerns over changes at Mines and the growing presence of women, and the wider global issues of Communism, the threat of nuclear weapons, and the Viet Nam war manifest in different ways.