Estonian Master Sgt. Tonu Tuul, the operations noncommissioned officer of 2nd Infantry Brigade , wears a green beret with a "Skull and Bones" symbol at the Estonian NCO Academy in Voru, Estonia, Mar. 16, 2016. The "Skull and Bones" symbol "comprises readiness to fight and willingness to sacrifice everything, including the most precious - our life," said Tuul. (Photo by Army Staff Sgt. Steven M. Colvin/Released)

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