Private military company (Doktor)

During the Raid at Denver in May 2018, the German cyborg researcher, Dr. Wilhelm Voigt (a.k.a., Doktor), hired a private military company to aid Raiden in retrieving the brain canisters from World Marshal Inc.'s corporate headquarters building. One of the stipulations Doktor had in regards to hiring the PMC was piloting the chopper in semi-auto mode, to monitor Raiden's progress and World Marshal's security systems and details.

After Raiden defeated Desperado leader Sundowner and learned of Operation Tecumseh, Doktor and several other members of the PMC arrived and secured the building as well as loaded the brain canisters into the chopper. After loading and securing the contents onto the chopper, the soldiers cleared Doktor for takeoff just as Raiden entered the cockpit.

Behind the scenes
The PMC was first mentioned in Chapter R-03, just after Raiden boarded the elevator to the rooftop area when Doktor called. Although the chopper used by the PMC appeared in Chapter R-05, personnel from the PMC (other than radio dialogue between Doktor and a soldier nearing the beginning of the chapter) are never actually seen.

The transport chopper used by the PMC was the same model as the one the Outer Heaven PMCs Praying Mantis and Pieuvre Armement utilized during their missions in the Middle East and South America, respectively.