The Defense Department is overhauling a key component of its National Defense Strategy -- its force planning construct -- in a move that could set the stage for a significant revision of U.S. war plans, weapon system investments and military organization, according to Pentagon officials. Pentagon leaders are crafting a new force planning construct that aims to better account for the post-Sept. 11, 2001, strategic landscape by focusing on three areas: homeland defense; the global war on terrorism; and conventional...