General Hayes was a MACO officer during the Earth-Romulan War. In 2155, Hayes was at a meeting in Prime Minister Nathan Samuels's office where Samuels declared that production of the NX-class would be stopped in favor of the Daedalus-class. Prior to that declaration, Hayes had made a disparaging remark about Starfleet's victory at Altair VI. (ENT novel: Beneath the Raptor's Wing)