The Valley Barge  is an unpowered glider. Since it unpowered, it cannot achieve flight on it's own but must be towed by a powered vehicle. In this case, it is towed by the Valley Gunship in the Periphery Campaign.
The Barge is able to land and take off from water .
a See Page Conversions Between Editions to convert Deluxe Edition volume 1 (DE1) to other editions