14 C.F.R. § 223.5
Responsibility of agencies
The Federal Aviation Administration, National Transportation Safety Board, National Weather Service, and the Postal Service shall be responsible for the following:
(a) The issuance of any credentials or certificates to their personnel eligible for free or reduced-rate transportation under this part; and
(b) The promulgation of any internal rules that are necessary to obtain compliance by such personnel with this part.