UNSC Two for Flinching
From Halopedia, the Halo wiki
The UNSC Two for Flinching was a UNSC Corvette.
The Two for Flinching was the corvette that took Staff Sergeant Avery Johnson and Petty Officer First Class Healy from Earth to Harvest.
The fast attack Corvette is known for being the UNSC's smallest captial warship and carries no fighters because the only thing that can fit inside a Fast-Attack Corvette's hangar bay is a SKT-13 shuttlecraft which is a reuseable version of the UNSC's Bumblebee life boats.