see more

US Secretary of Defence Ash Carter (L) meets with Saudi Arabia's Defence Minister Mohammed bin Salman on the sidelines of a meeting of NATO defence ministers at the NATO headquarters in Brussels, February 11, 2016. / AFP / POOL / Virginia Mayo (Photo credit should read VIRGINIA MAYO/AFP/Getty Images)

US Secretary of Defence Ash Carter (L) meets with Saudi Arabia's Defence Minister Mohammed bin Salman on the sidelines of a meeting of NATO defence ministers at the NATO headquarters in Brussels, February 11, 2016. / AFP / POOL / Virginia Mayo        (Photo credit should read VIRGINIA MAYO/AFP/Getty Images)