As orders of new AH-64Ds have been blocked, the IAF pursued upgrades to its AH-64A fleet.</ref> In June 2010, Israel decided not to upgrade all AH-64As to the D model due to funding constraints and lack of U.S. cooperation. In December 2010, the IAF was examining the adoption of a new missile system as a cheaper and lightweight complement to the Hellfire missile, either the American Hydra 70 or the Canadian CRV7. By 2013, IAF AH-64As were receiving a comprehensive upgrade of their avionics and electrical systems. The AH-64As are being upgraded to the AH-64Ai configuration, which is near the AH-64D standard.