One of the training nurses watches the computer program linked to the high-tech mannequin used for medical training, watching for proper chest compression rhythm, during a training exercise with the U.S. and Estonian military medical personnel, here, as part of Operation Atlantic resolve Nov. 13, 2014. The U.S. Army Europe-led Atlantic Resolve, a multinational combined arms exercise involving the 1st Brigade Combat Team, 1st Cavalry Division, and host nations, takes place across Estonia, Latvia, Lithuania, and Poland to enhance multinational interoperability, to strengthen relationships among allied militaries, to contribute to regional stability, and to demonstrate U.S. commitment to NATO.