A CH-47 Chinook helicopter crew chief keeps watch during a flight over Kabul, Afghanistan, April 24, 2017. The helicopter was carrying Defense Secretary Jim Mattis as he visited the country. DoD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley

A CH-47 Chinook helicopter crew chief keeps watch during a flight over Kabul, Afghanistan, April 24, 2017. The helicopter was carrying Defense Secretary Jim Mattis as he visited the country.

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