41 CFR § 302-9.202
When do I become entitled to return transportation of my POV from my post of duty to an authorized destination?
June 9, 2020
You become entitled to return transportation of your POV from your post of duty to an authorized destination when:
(a) Your agency determined the use of a POV at your post of duty was in the interest of the Government;
(b) You have the POV at your post of duty; and
(c) You have completed your service agreement.