the russian mi-28 havoc combat helicopter carrying bourne and colonel boris karpov , two of his men , as well as a two-man crew and a full complement of weapons , banked low over the iranian oil fields in shahrake nasiri-astara , and immediately they saw the two planes'one the air afrika jet karpov 's it man in khartoum had tracked here , the other a sikorsky s-70 black hawk painted matte black but with no markings : black river transport .