A Bizarre Warning Along the Appalachian Trail

While visiting the in-laws recently in Tower City, PA, I took a short run over in Stony Valley.  There is a rails-to-trails path off Gold Mine Road which intersects the Appalachian Trail some 3.5 miles in.

Anyway, an interesting warning sign appears at the trailhead, warning of possible unexploded ordnance from an Army base nearby:

Hope you can enlarge sufficiently to read the warning poster.  I don't know about you, but the last thing that I want to think about while I'm running trails is military activity and the possibility--even if extremely remote--of getting blown up.