technical manuals
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Perhaps technical manuals will be useless, considering that most tribal Afghanis have trouble grasping the difference between left and right, to say nothing of being able to read or read English.
Millions of machine guns, assault rifles, RPGs, and hand guns are available worldwide from arms dealers. The only difference is they got them free.
Leaving behind stockpiles of spare parts is not a fact, but an assumption.
Most of what you say are assumptions.