The sign on the wall reads “Schoolbook Printing and Storage Warehouse,” but the fact that the double gates in the wall have been crudely ripped off suggests that something more interesting might be inside. It turns out that the only books to be found in any of the three large buildings in the walled compound are manuals — how to fire rocket launchers and wire-guided missiles, among others. The buildings are actually disguised warehouses full of munitions — mortar shells, artillery rounds, anti-tank missiles and more — thousands of pieces of military ordnance that are completely unguarded more than two...