WASHINGTON, Jan. 23 (UPI) -- U.S. President Barack Obama faced down his three top military officials in a policy confrontation during his very first day in office, U.S. military sources have told UPI. On Wednesday, the president met with Secretary of Defense Robert Gates, Chairman of the Joint Chiefs of Staff Adm. Michael Mullen and Central Command commander four-star Gen. David Petraeus. Gates, supported by Mullen and Petraeus, vigorously argued that the president should back away from his campaign pledge to withdraw all U.S. combat forces from Iraq within the next 16 months and space out the withdrawal over a...