Related Rule
Germany
Practice Relating to Rule 61. Improper Use of Other Internationally Recognized Emblems
III. Military Manuals
Germany’s Military Manual (1992) states: “It is prohibited to make improper use … of special internationally acknowledged protective emblems.” 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, August 1992, § 473.
The manual also states: “During an international armed conflict, the use of the distinctive emblem for any other purpose than that of the protection of cultural property is forbidden.” 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten Konflikten – Handbuch, August 1992, § 932.