(Editor's note: this story was updated on July 19 to note a Marine Corps statement that the service is no longer interested in DARPA’s hypersonic weapon.) The Marine Corps, after discussing potential adoption of a hypersonic weapon with the Defense Advanced Research Projects Agency, recently waived off interest in fielding a ground-launched variant of an ultra-fast weapon, according to a spokesman. Marine Corps Combat Development Command clarified the service’s position after a senior Pentagon official characterized discussions between DARPA...