Declassified intelligence from the Vietnam Conflict that details the lessons learned from the counter insurgency-ops. It contains many diagrams of the improvised explosives and mines of the Vietcong. Great reading, it really shows you what the troops were facing. Lessons learned from this intel can still be used today! Do not attempt to construct any of the devices shown in these reports.
This is a wonderful resource from the JVB Militaria Library that you can have on your phone. Requires Adobe Acrobat Reader
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