“[W]hether a regulation of the Department of Veterans Affairs, 38 CFR § 3.358(c)(3) (1993), requiring a claimant for certain veterans’ benefits to prove that disability resulted from negligent treatment by the VA or an accident occurring during treatment, is consistent with the controlling statute, 38 U.S.C. § 1151 (1988 ed., Supp.V).”
“We hold that it is not.”