Career U.S. Defense Secretary Promotes ‘Lean In’ Groups to Help Boost Women in Military LeadershipCourtney ConnleySeptember 23, 2015September 28, 2017 by Courtney ConnleySeptember 23, 2015September 28, 2017239 U.S. Defense Secretary Ash Carter endorses "Lean In" discussion groups as part of his efforts to get more women and minorities into military leadership....