The U.S. Defense Department will begin a “comprehensive review” to find $400 billion in spending cuts as part of President Barack Obama’s plan to reduce the federal deficit/…/Todd Harrison, a defense budget analyst for the Washington-based Center for Strategic and Budgetary Assessments, which studies defense expenditures and national security strategy, said reaching that level of savings will require “more than just efficiencies.”“It will require making hard choices about force structure, pay, benefits and modernization programs,” Harrison said. “There are no magic bullets.”