From Destinypedia, the Destiny wiki
Species:
Cabal
Legion(s):
Red Legion
Role(s):
Commander
Mission(s):
Patrol European Dead Zone Hallows
Weapon(s):
Cabal Bronto Cannon (common)
Abilities:
Drone Shielding Limited Flight Strafe Thrusters High Durability Rapid Movement
The Field Commander rank is a very rarely seen cabal ranking.