An Iranian military truck carries the new Kamin-2 air defense missile system during a parade on the occasion of the country's annual Army Day on April 18, 2018, in Tehran. (Atta Kenare/AFP via Getty Images)
Iranian President Hassan Rouhani speaks at the Army Day parade, warning "invading powers" that Iran will produce or acquire any weapon necessary for deterrence. (Atta Kenare/AFP via Getty Images)
Iranian soldiers march in formation during the Army Day parade (Ebrahim Noroozi/AP)
An Iranian military truck carries the S-200 missile defense system past a portrait of Iran's Supreme Leader Ayatollah Ali Khamenei during a parade on the occasion of the country's annual Army Day. (Atta Kenare/AFP via Getty Images)
An Iranian military truck carries the S-200 missile defense system. (Atta Kenare/AFP via Getty Images)
An Iranian military truck carries a Naze'at rocket artillery piece past a portrait of Iran's Supreme Leader Ayatollah Ali Khamenei during a parade on April 18, 2018 in Tehran. (Atta Kenare/AFP via Getty Images)
An Iranian military truck carries parts of a S-300 air defense missile system during a parade on the occasion of the country's annual Army Day. (Atta Kenare/AFP via Getty Images)
An Iranian military truck carries missiles in an Army Day parade on April 18, 2018, in Tehran. (Atta Kenare/AFP via Getty Images)