Spektrs live up to their name. They are stealthy ghosts capable of the most astonishing feats of infiltration. When wetwork requires surgical precision, when the situation is too delicate to admit a single mistake, they call in these guys.
Tunguska uses them primarily for industrial espionage or extraction ops, for their own benefit or as an expensive service to third parties. Equipped with the most sophisticated cloaking and camouflage systems money can buy, they can walk past most surveillance systems undetected. Hence the rumor that they are not trained for infiltration, but are trained to disappear into thin air.