The Sentinel-class Landing Craft is a troop transport ship that is used by the Galactic Empire. It appears as a non playable troop transport, on the Kamino map.
This ship is only seen on Kamino and the Prison Break level on the Death Star in campaign mode, where you have to destroy one.
This ship was originally going to be used in the Imperial space maps, but was replaced in pre-production by the the Theta-class shuttle. It does however, appear as a flyable ship type (Imperial Shuttle) in Battlefront Elite Squadron.