U.S. soldier from Second Stryker Cavalry Regiment walks out of a military vehicle during a joint military...
A U.S. soldier from Second Stryker Cavalry Regiment walks out of a military vehicle during a joint military training with Bulgarian army soldiers at Novo Selo military base near the town of Sliven, some 350 km (217 miles) east of Sofia, September 17, 2009. REUTERS/Stoyan Nenov (BULGARIA MILITARY POLITICS)