37 USC 406a - Travel and transportation allowances: authorized for travel performed under orders that are canceled, revoked, or modified

Under uniform regulations prescribed by the Secretaries concerned, a member of a uniformed service is entitled to travel and transportation allowances under section 404 of this title, and to transportation of his dependents, baggage, and household effects under sections 406 and 409 of this title, if otherwise qualified, for travel performed before the effective date of orders that direct him to make a change of station and that are later
(1) canceled, revoked, or modified to direct him to return to the station from which he was being transferred; or
(2) modified to direct him to make a different change of station.