Simplistics Durland Line observation
Having been there long ago, traveling from Peshawar to Kabul, and elsewhere along and across the Durland Line, anyone who thinks Pakistan and Afghanistan can ever totally manage that long rugged terrain border is defying the reality of life over there.
No nation, including the US, can manage or seal it's entire borders, ever, just simply impossible to do.
Cold reality of the situation, which will continue to ebb and flow forever.
Border interdiction in COIN
It's all in the link:Border Interdiction in Counterinsurgency: A Look at Algeria, Rhodesia and Iraq
This is a 2006 USCGSC thesis and why in this thread? One cited example is the Morice Line; the threads on Rhodesia do not cover borders and Iraq is too big to find a home.
Just appeared on a BSAP History emailing and not read.