Mercenaries are civilians, retired soldiers, or criminals that are paid by a person to do an assignment given by the payer. Usually, a mercenary's only motivation is money. However they may also be driven by jealousy, hatred, grief, or pure curiousity.
In Outpost, D.C. was paid by Hunt to escort him on his journey through No Man's Land. D.C. constucted a team of six mercenaries to help with the assignment; Prior, Jordan, Cotter, McCay, Taktarov, and Voyteche.