 Canada had liquidated about half of its fleet of Leopard 1s in the early 2000s, with the intention of replacing them with the Mobile Gun System, but the decision was reversed.Full-rate production has been indefinitely deferred as of 2012.In late 2013, the U.S. Army began seeking to reintroduce an airdroppable mobile airborne protected firepower platform to provide fire support for air assault forces, a capability that had been absent since the retirement of the M551 Sheridan in 1997.