House authorizers want the Missile Defense Agency to consider at least two competitive designs for a system defending against hypersonic glide vehicle threats. The House Armed Services strategic forces subcommittee's mark of the fiscal year 2018 defense policy bill includes a provision requiring MDA to provide a briefing to lawmakers by Oct. 1 "that details the potential benefits, challenges and associated costs of an acquisition strategy allowing for at least two competitive designs until the operational demonstration," according to the...