Speed and stealth will suffice, as you can skip numerous mission steps. Gallop straight to Miller at Da Ghwandai Khar at the start of the mission, neutralize the base minimum number of guards to reach him in the north of the base and leave without detection, change the landing zone to avoid the confrontation with the Skulls, then exfiltrate as soon as the chopper arrives. When you replay this mission, you can change the extraction chopper's default landing zone to another position, thereby skipping the encounter with the Skulls entirely and completing the related Mission Task to avoid them.
This video clip is some different method, rushing to existing landing zone encountering Skulls "bravely and Quickly".
