U.S. and Bulgarian flags fly over a static equipment display Nov. 8, 2012, during exercise Allied Force 2012 in Novo Selo, Bulgaria. Allied Force involved U.S. Army Europe's 172nd Infantry Brigade Combat Team, 173rd Airborne Brigade Combat Team and the Bulgarian Land Forces? 1st Battalion Battle Group, 61st Mechanized Brigade and was the final stage in the Bulgarian unit's 18-month training and certification process.