Maj. Gen. Rick Mattson, Central Command, director of exercises and training, attends an immersion meeting for exercise Regional Cooperation 15 in Dushanbe, Tajikistan, Sept. 19, 2015. Participants in RC15 focus on cooperating as a United Nations peacekeeping force through training on peacekeeping capabilities, and participation in international efforts. ( Air Force photo by Senior Airman Nigel Sandridge/Released)

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