Yes all you need to do is add the three lines and change what i said.
#Loop
_unit = West_2; _mark = "West_2_Marker"
?(alive _unit): _mark setmarkerpos [getpos _unit select 0, getpos _unit select 1]
?(!alive _unit): _mark setmarkerpos [0,0]
_unit = West_1; _mark = "West_1_Marker"
?(alive_unit): _mark setmarkerpos [getpos _unit select 0, getpos _unit select 1]
?(!alive_unit): _mark setmarkerpos [0,0]
Goto "Loop"
Rhys