The U.S. Air Force recently contracted with defense manufacturer Lockheed Martin to develop two new U.S. hypersonic weapon systems. In August 2018, the Air Force awarded $480 million to develop the Air-Launched Rapid Response Weapon (ARRW), seeking an initial operating capability in late 2021. Designated the AGM-183A , the ARRW is being designed as a hypersonic air-to-surface missile for tactical strike. In April 2018, the Air Force awarded $928 million to rapidly develop the Hypersonic Conventional Strike Weapon (HCSW), for an IOC of 2022. A hypersonic glide vehicle system meant for long-range strike, the HCSW will use solid-fuel propellant and is at least partially guided through GPS.