A Shadow Marshal is the designated term for one of the ISA's covert assassins. They are a branch of the ISA's Special Forces, much like the Infield Agents, and are feared and loathed throughout the Helghan ranks, as they're possibly responsible for the murders of many prominent Helghan officers. Being cold and calculating, they have no room for the more irrelevant and impulsive emotions, and only think about how to accomplish one mission or the next.
Shadow Marshals are known to don infiltration gear like thermal-vision goggles, black balaclavas, and light armor for maximum mobility. Their armaments include a silenced submachine gun and an expertly wielded combat knife, the latter of which has earned them their gruesome reputation throughout Human space, and left many Helghan Third Army soldiers dead without a sound ever being heard.
Under the Vektan Security Agency Shadow marshals perform very similar roles as they did within the Second Extrasolar War, although now their focus has shifted to preserving the peace rather than weakening other nations. They are few and far between and upon graduating their course, they take an oath to preserve life at any cost. With the use of multipurpose rifles and OWL drones the Shadow Marshal has in 30 years evolved into a small army.