Reducing Barriers to Veterans' Benefits Act - Presumes a service connection, for veterans' benefits purposes, for diagnosed hearing loss, tinnitus, or both, for veterans who, during active military service: (1) were assigned to a military occupational specialty in which the veterans were likely to be exposed to a level of acoustic trauma sufficient to result in permanent hearing loss, tinnitus, or both; or (2) served in combat against a hostile force during a period of hostilities.