John, an explosives detection dog assigned Mobile Assault Platoon 4, Weapons Company, 1st Battalion, 25th Marine Regiment, waits in the back of a 7-ton truck before going on a patrol in the southern portion of the Washir district, Helmand province, Oct. 4. The Marines of Weapons Co. have been familiarizing themselves with the southern border of Task Force Belleau Wood’s battle-space in central Helmand since arriving in Afghanistan in September.