North Dakota National Guardsmen Sgt. Zach Brainert, right, and Spc. Amanda Sumacher, left, both medics assigned to the 814th Medical Company, demonstrate rescue breathing with a bag valve mask, a hand-held device used to provide positive pressure ventilation July 14, 2011, at Burma Camp, Accra, Ghana, during Medflag 11. Medflag is an annual multinational medical training exercise designed to enhance medical capabilities and readiness for U.S. and African forces.