The Sixteenth Fleet was a numbered Federation fleet active in the late 24th century It was one of many Federation and allied fleets that were involved in the Dominion War.
On stardate 51474.3 the Dominion launched an attack against Coridan, which was defended by the Sixteenth along with the Sixth Fleet. The two fleets managed to drive the Jem'Hadar away, but not before significant damage was done, which crippled dilithium production on the planet for months. (LUG RPG: The Dominion War Sourcebook: The Fires of Armageddon)
USS Henri Dunant — commanded, in order of succession, by Captains Ann Dysinger, Ken Dysinger, Dave Pitts, and Jim Douglas — was a converted Olympus-class dreadnought that served as a hospital ship during this time. Its primary deployment in the late 2370s was to the Sixteenth Fleet. The Sixteenth was then under the flag command of Commodore Adam Self. (Starfleet International)
Fan organizations[]
The Sixteenth Fleet was also a nickname for chapters of Starfleet International in Region 16 — Japan, North Korea, South Korea, the Philippines, Micronesia and Guam. As of 2008, there was only one chapter ever in that Region, the Henri Dunant which was active from early 1993 until late 1996/early 1997. (Starfleet International: Starfleet Communiqué 74 (April-May, 1996))