Everything Veterans Affairs does with your service connected disability compensation claim, is governed by law. 

It can be a bit daunting. Just remember the U.S.C. is the law, the C.F.R. is how they interpret the law and last but certainly not least is the V.A. adjudication manuals that is how they apply the law. The section of the law that covers the veterans benefits is Title 38 in the U.S.C. in the C.F.R. is usually written 38 C.F.R. or something similar.

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