The SKT-13 Shuttlecraft is a Human space shuttle. Described as a larger version of the Class-3 "Bumblebee" Lifeboat, they are used to ferry UNSC materiel and personnel to and from various locations or ships. This ship is mainly used for in system shuttling for the wounded or for research.
In Halo: Contact Harvest, the SKT-13 Shuttlecraft was used to transport Staff Sergeant Avery Johnson and Corpsman Petty Officer First Class Healy off of the UNSC Two for Flinching. The fast-attack corvette delivered them to the Tiara, a space station in equatorial geosynchronous orbit over Utgard, on the planet Harvest.