[IronDuke99]

In a COIN scenario that is a planned operation, say clearing a village, I think it would be fair to have the Western assets on call at the outset.

Also bear in mind these days you are likely to have all the troops on a radio net, of some kind, not just a platoon or even section/squad commanders. So if, in a planned operation, a platoon or section gets pinned down, or even comes under heavy fire, it is often fairly easy to call in air support, helos, artillery etc and to get that support fairly quickly.

An ambush of a patrol, can be a different thing, especially if your force is less 'asset rich' than the US tends to be. People may recall the Royal Marine hanging on to the outside of a Apache attack helo in Afghanistan (I think he was trying to get to a friendly casualty) because at that stage the Brits still did not have enough transport helos in Afghan...