41 CFR § 301-51.5
If my agency grants an exemption, does that prevent me from using the card on a voluntary basis?
June 9, 2020
No, an exemption from use would not prevent you from using the Government contractor-issued travel charge card on a voluntary basis in accordance with your agency's policy.
[FTR Amdt. 90, 65 FR 3055, Jan. 19, 1998. Redesignated by FTR Amdt. 2016-01, 81 FR 63138, Sept. 14, 2016]