Lockheed is pushing for funding for the development of an ER version of the THAAD to counter maturing threats posed by hypersonic glide vehicles adversaries may employ, namely the Chinese WU-14, to penetrate the gap between low and high-altitude missile defenses. The company performed static fire trials of a prototype modified THAAD second booster in 2006 and continued to self-fund the project until 2008. The current 14.5 in (37 cm)-diameter single-stage booster design would be expanded to a 21 in (53 cm) f
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