i believe the gentleman means either put an m2 machine gun on the map, then setpos it into place, or camcreate one out of thin air, assigning a gunner to it. either will have the effect you're after, as the m2 machine gun has a light on it.
moving it is easier - just create it somewhere remote - on an island is usually a good bet - and make sure its behaviour is set to aware. give it a name too. put an invisible marker next to it, and put an invisible marker where you want it to be, then use this -
m2_name setpos getmarkerpos "invis_marker_flasher"
~1
m2_name setpos getmarkerpos "invis_marker_home"
~1
m2_name setpos getmarkerpos "invis_marker_flasher"
~1
m2_name setpos getmarkerpos "invis_marker_home"
that should do it.