38 C.F.R. § 76.2
(a) VA will pay an allowance to a veteran with a disability who is:
(b) In providing this allowance, VA will periodically assess funding for the allowance. If a periodic assessment reveals that funding is insufficient to pay all applicants, VA will first pay in full veterans with service-connected disabilities, and then pay others in full in the order in which their completed applications are received.
(Authority: 38 U.S.C. 322(d))