units training in Bulgaria included over 1,400 personnel including soldiers from the Tennessee Army National Guard's 1-181st Field Artillery Battalion out of Chattanooga, Tenn.; 2nd Squadron, 2nd Stryker Cavalry Regiment, from Vilseck, Germany, and the Tennessee Army National Guard's 117th Military Police Battalion.Over 500 Bulgarian Land Forces participated including the 4th Artillery Regiment of Asenovgrad; 68th Special Forces Brigade from Plovdiv; 61st Mechanized Brigade of Karlovo; 5th Mechanized Brigade of Pleven; and Center for Preparation of Tank Specialists out of Sliven.