Quote Originally Posted by Kiwigrunt View Post
An OC of mine used to refer to single file as 'idiot file'.

However, is a single file always necessarily an idiot file? Is it not a matter of balancing pros against cons? I assume (please correct me if this is wrong or simplistic) that a reason for it in Astan was to follow narrow routes, where IEDs were (perceived as) the main threats. Kinda like a cleared route through a minefield.

Terrain can be another reason for using the idiot file, if narrow channels of undulation or vegetation in otherwise flat or open ground provide the only cover or concealment. A double edged knife of course, given that these channels are ideal places for IEDs.

However, I'm still interested to see if my assumption as to why single file was so prevalent in Astan is correct.
Yes, you've pretty much got it. It sometimes is the best tactical option for small patrols. But when it becomes your default formation and you lack the ability to move competently in any other way, that's a problem. Most of Helmand, let alone Afghanistan, is not a minefield.