ARLINGTON, VA - JANUARY 10: U.S. Defense Secretary Leon Panetta (L) and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey participate in a news briefing at the Pentagon January 10, 2013 in Arlington, Virginia. Panetta and Dempsey announced that the Pentagon will begin reversible sequester preparations including pulling back military maintenance not critical to immediate missions, freezing civilian hiring and other steps against a possible $45 billion spending cut that could be in effect in March. (Photo by Alex Wong/Getty Images)