SF in Hawaii mentioned this copy of the US Army Field Manual FM 90-7 [1], housed at the GlobalSecurity.org web site. SF’s comment: “Click on the figures in this manual and you’ll see some good examples of defensive obstacles.”
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A Colorado city besieged by copper thieves [2]
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I noticed an interesting thread of discussion in progress at The Claire Files forums, on choosing a gun for bear protection, while horseback. [3]