A Moldovan soldier waits behind cover while training with Romanian and Polish soldiers July 16, 2013, in Yavoriv, Ukraine, during Rapid Trident 2013. 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.