A Canadian Army combat engineer, right, talks to a Ukrainian military observer-controller during a situational training exercise as part of Rapid Trident 2014 in Yavoriv, Ukraine, Sept. 17, 2014. Rapid Trident is an annual joint combined exercise involving the U.S. and Partnership for Peace member nations. Missions alternate in odd and even years. In odd years Rapid Trident is a field exercise, while in even years the exercise incorporates a command post exercise.