The President, under regulations to be prescribed by him, may award a decoration called the “Medal for Merit”, having distinctive appurtenances and devices and only one degree, to any civilian of any nation prosecuting the war in existence on July 20, 1942, under the joint declaration of the United Nations, as then constituted, or of any other friendly foreign nation, who, after September 8, 1939, has distinguished himself by exceptionally meritorious conduct in performing outstanding services. The Medal for Merit may be awarded to a civilian of a foreign nation but only for performing an exceptionally meritorious or courageous act in the furtherance of the war efforts of the United Nations as then constituted.