Why did US not use that technology to stop crossborder "infiltration" on Pak-Afghan border?
1 - they dont have 700,000 troops there
2 - LOC is a lot smaller, and many routes are covered by snow which limits which routes are passable
3 - Pak-Afghan border is 2,000km long
4 - The Pak-Afghan border is not mined or militarized....due to people living on both sides who have common families on both sides of border....