sentences:  The Advanced Research Projects Agency (ARPA) examined the requirements and recommending a system, designated Nike-X, incorporating phased-array radars, high-performance computers, and separate low-altitude (Sprint) and high-altitude (Spartan) high-velocity interceptor missiles.To manage this development, in 1963 MICOM created the Nike-X Project Office headed by Colonel (later Brigadier General) Ivy O. Drewry.The People's Republic of China exploded its first thermonuclear bomb in June 1967.