C.F.R. Code of Federal Regulations – The C.F.R. is the interpretation of the law.
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, V.A. frequently requested manuals are listed below.
VA M-21 Compensation and Pension Manual
VA M-21-4 C & P Authorization Procedures
VA M28-3 Vocational Rehabilitation Internal Control in Vocational Rehabilitation and Counseling
VA M29-1 VBA Insurance Operations Manual