Captain Monico C. Aguayo was a Starfleet officer during the Dominion War.
In 2374, a file from the starship Exeter reported Aguayo killed in action. (DS9: "In the Pale Moonlight")
Aguayo's name appeared on the casualty list display seen on a computer readout in that episode. There were more than one captains listed under the Exeter in the list, so it is unclear which was the ship's captain, if any.