I've tried several times to complete this mission single player - I have SOG AI installed, no other mods - and I get the message to board the slick with the orange marker (relocated down the hill by the SOG AI mod) but the slick never arrives. Is this a SOG AI issue? I've tried disabling it before calling for extraction.
edit - I then tried not making the radio call and triggering the other ending of the mission, defended the LZ for several minutes but again, no helo ever arrives.