A Bulgarian soldier repels an enemy attack at the Koren Field Training Ground in Bulgaria Oct. 16, 2014, as part of Atlantic Resolve. Europe-based U.S. Army units were deployed to Poland, Lithuania, Estonia and Latvia to conduct bilateral military exercis

- Image ID: E9W1JF
A Bulgarian soldier repels an enemy attack at the Koren Field Training Ground in Bulgaria Oct. 16, 2014, as part of Atlantic Resolve. Europe-based U.S. Army units were deployed to Poland, Lithuania, Estonia and Latvia to conduct bilateral military exercis
501 collection / Alamy Stock Photo
Image ID: E9W1JF
A Bulgarian soldier repels an enemy attack at the Koren Field Training Ground in Bulgaria Oct. 16, 2014, as part of Atlantic Resolve. Europe-based U.S. Army units were deployed to Poland, Lithuania, Estonia and Latvia to conduct bilateral military exercises and reinforce NATO security commitments to the host nations