Highly Skilled Soldiers are various soldiers that Diamond Dogs commander Venom Snake can extract and recruit into his private army. Depending on who the soldier is, they will be ranked higher than the average soldier that Venom can find in Afghanistan or Africa. They are easily identified by their wearing balaclavas.
Behind the scenes
Highly Skilled Soldiers are soldiers that are featured in the side ops in Metal Gear Solid V: The Phantom Pain. There are 16 "extract the highly skilled soldier" side ops in total.