Defense acquisition chief Ashton Carter has authorized the Army to buy 29 Gray Eagle unmanned aircraft and requisite ground equipment as part of a second low-rate initial production lot, according to a Pentagon spokeswoman. Carter's March 25 approval followed a March 22 Defense Acquisition Board meeting devoted to the program, Cheryl Irwin wrote in an April 5 e-mail to Inside the Army . The Army requested $506 million for the current fiscal year, enough to buy the 29 aircraft due...