ARLINGTON, VA - SEPTEMBER 17:  Secretary of Defense Robert M. Gates (L) and Vice Chairman, Joint Chiefs of Staff, Gen. James E. Cartwright (R) answer questions during a press briefing at the Pentagon on September 17, 2009 in Arlington, Virginia. Gates spoke primarily about a change in strategy on missile defense planning that would scrap a plan proposed by former U.S. President George W. Bush and instead focus efforts on revising the system to counter possible threats posed by shorter range Iranian missiles. Getty Images logo Getty Images 2 months ago

ARLINGTON, VA - SEPTEMBER 17: Secretary of Defense Robert M. Gates (L) and Vice Chairman, Joint Chiefs of Staff, Gen. James E. Cartwright (R) answer questions during a press briefing at the Pentagon on September 17, 2009 in Arlington, Virginia. Gates spoke primarily about a change in strategy on missile defense planning that would scrap a plan proposed by former U.S. President George W. Bush and instead focus efforts on revising the system to counter possible threats posed by shorter range Iranian missiles.