This primary source comes from the Records of the U.S. Marine Corps.
Full Citation: Roberto Clemente's Honorable Discharge from the US Marines Corps; 9/11/1964; Official Military Personnel File of Roberto C. Walker (Roberto Clemente); Official Military Personnel Files, 1905 - 1998; Records of the U.S. Marine Corps, Record Group 127; National Archives at St. Louis, St. Louis, MO. [Online Version, https://docsteach.org/documents/document/roberto-clementes-honorable-discharge, May 3, 2024]