The Pentagon is calling on the Defense Science Board to investigate the nation's ability to locate and attack deeply buried adversary targets, such as bunker and tunnel facilities, according to a recent memo from Heidi Shyu, the defense under secretary for research and engineering. “Underground and concealed facilities continue to be widely used by adversaries to protect strategically important capabilities meant to disrupt United States (U.S.) military capacity,” the letter notes. “These defeat solutions are imperative in achieving the desired...