The OSHC was a Starfleet division that investigated the disappearances of the crewpeople from Utopia Planitia Fleet Yards in 2362. The investigation ended inconclusively on stardate 40999. (TNG: "Eye of the Beholder")

The branches of Starfleet
United Earth: Command • Materiel Supply Command • Medical • Mission Control • Security • Section 31 • Training Command
United Federation of Planets: Administration • Administrative Operations • Advanced Technologies • Cartography • Command • Communications • Control • Dental • Engineering Corps • Exploratory Division • Information • Inspector General • Intelligence • Internal Affairs • Judge Advocate General • Materiel Supply Command • Medical • Mission Operations • Operational Support Services • Operations • Orbital Operations • OSHC • Research and Development • Science • Section 31 • Security • Shipyards Operations • Stellar Imaging • Tactical • Training Command • Warp Technologies