Georgian soldiers detain a mock enemy fighter during a joint NATO-Georgia military exercise at a military base in Vaziani, outside Tbilisi, Georgia, Tuesday, July 21, 2015. The “Agile Spirit 2015” maneuvers gather troops from the USA, Georgia, Romania, Bulgaria, Lithuania and Latvia to exercise in support operations and peacekeeping simulations until July 22, 2015. (Photo by Shakh Aivazov/AP Photo)

A Georgian military helicopter takes part in a joint NATO-Georgia military exercise at a military base in Vaziani, outside Tbilisi, Georgia, Tuesday, July 21, 2015. (Photo by Shakh Aivazov/AP Photo)

US marine fires a machine gun during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. Georgian soldiers along with U.S. marines and platoon-size units from Bulgaria, Latvia, Lithuania and Romania are taking part in the exercises at the Vaziani military base outside Tbilisi. (Photo by David Mdzinarishvili/Reuters)

Georgian soldiers take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US soldier s drive a military vechicle during a joint NATO-Georgia military exercise at a military base in Vaziani, outside Tbilisi, Georgia, Tuesday, July 21, 2015. (Photo by Shakh Aivazov/AP Photo)

Romanian soldiers take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US marines drive their Humvees vehicles during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Georgian soldiers take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Georgian medevac helicopter flies over US marine Humvees during in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Romanian soldiers take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Bulgarian soldiers gesture as they approach Georgian soldier (R) during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US marine fires his machine gun as Georgian soldiers take positions during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Georgian soldiers take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Romanian soldiers march during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US marines take part in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Georgian medevac helicopter flies during in a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US marines take part a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

US soldiers take part in a joint NATO-Georgia military exercise at a military base in Vaziani, outside Tbilisi, Georgia, Tuesday, July 21, 2015. (Photo by Shakh Aivazov/AP Photo)

US marine controls his machine gun during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)

Romanian soldiers march during a joint military exercise with NATO members, called “Agile Spirit 2015” at the Vaziani military base outside Tbilisi, Georgia, July 21, 2015. (Photo by David Mdzinarishvili/Reuters)