A Polish Army tank takes part in the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)




A Polish Army helicopter supports soldiers during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





German army tanks are lined up after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)




Polish Army tanks take part in the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)




Polish Army special forces soldiers stand with their gear after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)




German Defence Minister Ursula von der Leyen speaks with German soldiers after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)




From left, German Defense Minister Ursula von der Leyen, NATO Secretary General Jens Stoltenberg, Norwegian Defense Minister Ine Eriksen Soereide, Netherlands Defense Minister Jeanine Hennis-Plasschaert and Poland's Defense Minister Tomasz Siemoniak pose for a photo after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





German Defense Minister Ursula von der Leyen speaks with German soldiers after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





German Defense Minister Ursula von der Leyen speaks with Supreme Allied Commander Europe Gen. Philip M. Breedlove after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





From left, German Defense Minister Ursula von der Leyen, NATO Secretary General Jens Stoltenberg, Norwegian Defense Minister Ine Eriksen Soereide, Netherlands Defense Minister Jeanine Hennis-Plasschaert and Poland's Defense Minister Tomasz Siemoniak pose for a photo after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





German Defense Minister Ursula von der Leyen speaks with German soldiers after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Soldiers lead a captive away during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Norwegian soldiers stand next to their gear after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





A Polish Army soldier covers the barrel of a tank after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





U.S. Army helicopters support soldiers during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Soldiers attack a building during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Soldiers lead a captive away during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





A Royal Dutch Army soldier wipes his face after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Flags wave in front of soldiers who take positions with their army vehicles during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Soldiers take part in the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





U.S. Army helicopters transport soldiers during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Polish Army soldiers check their tank after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Helicopters fly over soldiers who attack a building during the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Supreme Allied Commander Europe U.S. Gen. Philip M. Breedlove speaks with a soldier of the Royal Dutch Army after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





Defense Minister of the Netherlands Jeanine Hennis-Plasschaert speaks with Dutch soldiers after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)





NATO Secretary General Jens Stoltenberg, center, and Polish Defense Minister Tomasz Siemoniak, right, look on after the NATO Noble Jump exercise on a training range near Swietoszow Zagan, Poland, Thursday, June 18, 2015. (AP Photo/Alik Keplicz)