The Starfleet Technology Support Division (or TechSupDiv) was a branch within the United Federation of Planets Starfleet, based in San Francisco. As of 2269, it was headed by Admiral Raycheba.
After the Talin incident, Spock was transferred to the Technology Support Division. Approximately three months later, Spock tendered his resignation, which was accepted immediately by Raycheba. (TOS novel: Prime Directive)