At a time of national debate about women’s struggle to land top corporate jobs, an unlikely industry is leading the change in the executive suite: defense contractors, where three of the biggest firms are now led by women. General Dynamics, BAE Systems and Lockheed Martin have have defied a long history of male-dominated culture and appointed female chief executives... The defense industry has been slow to promote women to its highest levels, in part because of its close connections to the military....Equilar...analysis found that one in eight executives at any level at those firms is a woman.“ [refers to Facebook, Yahoo]