Donny Parr is one of the technical staff working on The Program, having been introduced during Program V2's second announcement. He was at least partially responsible for the design and creation of the collars, stating that he had done about a third of the work in developing the collars, and half in conceptualising them. This leads him to being envious of Robin Charrell, as Parr feels that he is getting all the credit and reward for the collars, with Parr also wanting to be in charge rather than just another member of the crew. That having been said, Parr only appears to be slightly bitter over this, and does not take the frustration out on Charrell.
Considering Parr's role, he probably has military rank, but if so this has yet to be revealed.