It was suggested that if a squad leader needed a helo extraction that he should pop a smoke and an icon should appear on the map where the LZ was needed.
I thought a better idea and more realistic, would be to have the SL pull out his map, and click the location where they need pick-up...at least that would symbolize to a degree, the utilization of a GPS equipt battlefield computer.

Marine Air Systems (NZ) Ltd - Products - Indirect Fire Control
It would also leave room for error...error by design...SLs would have to pay attention to their maps vs. their current position so that they didnt place an LZ in a poor area.
This too is also quite real world.

this is the extraction marker that will show up on the map.

