The 6-4 make their debut in the mission "The Ark", where they assist Pilot Cooper in taking control of the IMS Malta. They helped Cooper clear the infantry surrounding the ship's anti air guns, then joined him on the ship to clear its main hangar and bridge. After the IMS Malta changed course, they provided cover fire during Cooper's battle with Viper. Later, they use the Malta to prevent Cooper from being surrounded by IMC forces during his confrontation with Slone. They escape Typhon before it is destroyed.
In The Ark, the 6-4 go by the callsign of "Blackbird 6-4", with other Crow dropships going by callsigns such as "Blackbird 6-3" and "Blackbird Actual". It is unknown if the 6-4 took their name from this callsign or vice versa.