The U.S. Army Medical Department Center and School (AMEDDC&S) — located at Fort Sam Houston, Texas — is both a school and a "think tank". The School — known as the Academy of Health Sciences (AHS) — serves the U.S. Army in educating and training all of its medical personnel. The Center formulates the Army Medical Department's (AMEDD's) organization, tactics, doctrine, and equipment. Although its institutional lineage dates back to 1920, the present "C&S" were established by permanent order of the Surgeon General in 1991.