The Defense Department is exploring the possibility of packing Navy ships with Army missiles after a hardware demonstration last year in Hawaii proved the feasibility of integrating the most advanced Patriot interceptor, the PAC-3 Missile Segment Enhancement, with the Aegis weapon system. Lockheed Martin, maker of the PAC-3 MSE and the Mark-41 Vertical Launch System, is independently funding a project to integrate the Army guided missile with the Navy’s Aegis combat system in a move that could allow the company...