Whoever intentionally destroys, impairs, injures, interferes or tampers with real or personal property with reasonable grounds to believe that such act will hinder, delay or interfere with the preparation of the United States or of any of the states for defense or for war, or with the prosecution of war by the United States, shall be punished by imprisonment for not more than ten years, or by a fine of not more than ten thousand dollars ($10,000.00), or both.