I can't get past Step 5 of the "Help Construct Antares 1" mission. The mission instructions say "Help keep Antares 1 workers safe by slaying hostile Voltoi Observation Post B."
I've killed a bunch of different Voltoi around that point with no result. Could someone let me know what specific Voltoi I'm supposed to kill?
I did search the forums and google, but only found a complaint about step 8 in this quest line.