In 1963, Bro. Donald Gaskill, S.M. was appointed principal of Chaminade High School to continue to establish the Marianist traditions of education, as well as reach out to the local communities. He would remain until 1969, with the appointment of Bro. Michael Galvin, S.M.. He was primarily responsible for obtaining accreditation from the Southern Association of Colleges and Schools. Chaminade High School was accredited for the first time in 1973. In 1973, Fr. Richard Knuge, S.M. was appointed principal. Under his administration, construction of a school chapel and library was completed. The school's fifth principal, Bro. Donald Winfree, S.M., supervised the construction of the Strickroth Classroom building, named in honor of Bro. John Strickroth, S.M.