In Rainbow 6 Extraction, the alien Parasite has infiltrated Earth, and in particular New York City. React sends out various operators to learn more about the aliens, the archaeons and the parasite in general. One of the most useful operators is the stealth operator Vigil.

To level up the stealth operator Vigil, keep doing missions, but make the hero does not go MIA, and keep going back and getting extraction to retain and get experience points to level up the operators.