an operational ballistic missile with a live warhead from the , which was situated near PMRF. The nuclear warhead flew toward Christmas Island and detonated in an air burst at . The Navy is currently using PMRF to test "hit to kill" technology using direct collision of the anti-ballistic missile with its target. This destroys the target by using only kinetic energy from the force of the collision. The two Missile Defense Agency programs that currently utilize the range at PMRF are the Navy's Aegis Ballistic Missile Defense System and the Army's Terminal High Altitude Area Defense System, or THAAD. The THAAD program relocated their testing operations from the White Sands Missile Range in New Mexico and conducted its first demonstration at PMRF on 26 January 2007. On 27 April 2007, the U.S. military's sea-based missile defense system, the Aegis Ballistic Missile Defense System, showed it could intercept two targets simultaneously when it destroyed a cruise missile and a short-range ballistic missile during a test off the Hawaiian island of Kauai. The test marked eight out of ten times the Missile Defense Agency and U.S. Navy's Aegis missile defense system successfully intercepted its target, but was the first time the system knocked out two targets at the same time. PMRF Agriculture Preservation Initiative The Navy is currently working with the State of Hawaii and Kauai County to ensure the long-term viability of PMRF. For many decades, the land adjacent to PMRF was used for sugarcane fields, which was wholly compatible with operations at PMRF. Since Kekaha Sugar's closure, the Navy has become wary of "encroachment", incompatible developments, that might occur on the land next to the base. In order to ensure that PMRF can continue to safely conduct important research and training operations in the future, the Navy and some citizens of Kauai are seeking to permanently preserve the land adjacent to PMRF for agricultural purposes. Under the PMRF Agriculture Preservation Initiative the Navy would have the roughly of land adjacent to PMRF preserved solely for agricultural use. Although the Navy has stated that it would like to lease about of land, it has also stated that its main goal is not to purchase more land but to merely ensure the land continues to be used for agricultural purposes. Operational deployment of THAAD When North Korea threatened to launch Taepodong-2 ICBMs toward Hawaii in 2009, the US temporarily deployed a