 On 9 January 2014, a Chinese hypersonic glide vehicle (HGV) referred to as the WU-14 was allegedly spotted flying at high speeds over the country.The flight was confirmed by the Pentagon as a hypersonic missile delivery vehicle capable of penetrating the U.S. missile defense system and delivering nuclear warheads.The WU-14 is reportedly designed to be launched as the final stage of a Chinese ICBM traveling at Mach 10, or .