An Israeli high-school senior poses for a photograph as he wears a mask during urban fighting drill as part of privately run military combat fitness training as part of privately run military combat fitness training to prepare for national military service in Israeli settlement of Mizra, northern Israel. March 24, 2015.

An Israeli high-school senior poses for a photograph as he wears a mask during urban fighting drill as part of privately run military combat fitness training as part of privately run military combat fitness training to prepare for national military service in Israeli settlement of Mizra, northern Israel. March 24, 2015.