Pentagon technology chief Heidi Shyu has tasked the Defense Science Board's Permanent Subcommittee on Strategic Options with running a study that would evaluate the use of commercial navigation signals for potential military operations. “The study should include the benefits of commercial constellations broadcasting [position, navigation and timing] signals for DOD operational usage,” Shyu wrote in a Jan. 12 DOD memo outlining the terms of reference for the study . “The evaluation of these commercial alternatives must consider issues including security,...