§8191,which extended the benefits of the Federal Employees Compensation Act to state and local law enforcement officers who are injured while engaged in the apprehension of persons committing federal crimes. The purpose for enacting section 8191 was to provide such injured local law enforcement officers with the same benefits as are available to federal employees under the Federal Employees Compensation Act…A companion section, 5U.S.C. § 8192, provides that the benefits received should be reduced by the amount of benefits paid by state or local governmental sources, including workmen’s compensation benefits.