Origin Pashtun - meaning a fortified position.
A guard post made by the sappers or pioneers out of breeze blocks, ammo boxes or sandbags, which they tell you are bullet proof. Days earlier on a firepower demo you had witnessed these same breeze blocks letting in everything fired at them bar an airgun pellet. Damn good for the OR's morale, though the small of urine and wet hessian is enough to gladden anyone's heart.
Most sangars have now been removed due to normalisation of the Province, though they can still be found on RAF airfields - a relic of the Cold War. Sangars are handy for a bit of covert Hand to Gland Combat training should the mood suit. Can you make the money shot before your mucker comes back up the ladder after a piss?