U.S. Army Sgt.1st Class Alisha Hunt-Harris assigned to Allied Forces North Battalion explains the inspection and preparation of properly sealing NBC mask from a manual to Staff Sgt. Enrico Arroyo (AFNORTH) during the Squad Training Exercise (STX) at the Alliance Training Area (ATA) in Chièvres Air Base, Belgium, March 24, 2015. Focus of training was to re-enforce warrior tasks and battle drills (WTBD) to include NBC, squad movement techniques, vehicle search, react to an improvised explosive device, and to perform a 9-Line medevac. (U.S. Army photo by Visual information Specialist Pascal Demeuldre-Released)