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An Iranian military truck carries parts of the S200 missile system during the Army Day parade in Tehran on April 17, 2015. / AFP / CHAVOSH HOMAVANDI (Photo credit should read CHAVOSH HOMAVANDI/AFP/Getty Images)

An Iranian military truck carries parts of the S200 missile system during the Army Day parade in Tehran on April 17, 2015. / AFP / CHAVOSH HOMAVANDI        (Photo credit should read CHAVOSH HOMAVANDI/AFP/Getty Images)