The Defense Department is laying plans to upgrade its future fleet of long-range hypersonic glide vehicles as frequently as every two years, creating windows for new technology insertion as experimental capabilities prove ready for production in a bid to catch up -- and overtake -- China’s current dominance of the near-space domain. Vice Adm. Johnny Wolfe, the Navy's director for strategic systems programs and point man for design of the U.S. military’s marquee hypersonic strike weapon, said the Pentagon has...