Staff Sgt. Bernardino Castillo, U.S. Army NATO Brigade G6 NCOIC, shows Maj. Jeffery Fritz, bilateral cooperation manager at German Army Command in Strausberg, Germany, how to use a card reader with his mobile phone during a week of training for the Soldiers at Sembach, Germany Oct. 31 to Nov. 4. The Military Personnel Exchange Program is a security cooperation program involving the reciprocal exchange of personnel between the U.S. Army and a similar unit in a foreign military service.