Combat Merchant Mariners Veterans Benefits Act of 2003

Combat Merchant Mariners Veterans Benefits Act of 2003 - Provides that: (1) qualifying service in the U.S. merchant marine during a period of war for a total period equal to at least 12 months shall be considered active duty in determining eligibility for veterans' benefits; and (2) such service may be verified by entries in a continuous discharge book, a certificate of discharge to merchant seamen, a certificate of substantially continuous service, or other documentation available from the Secretary of Transportation or the head of any other Federal agency.