Artikel 21

1. Within and over their installations, the authorities of the Forces may take all the mesures necessary for the accomplishment of their mission, provided that they shall observe German regulations in the fields of public health and safety unless their own regulations in such fields prescribe equal or higher standards. Insofar as their own regulations in the fields of public health and safety do not prescribe such standards, and also in other fields, the authorities of the Forces may, except as otherwise provided in this Convention or in any other applicable agreement, apply their own regulations, provided that in so doing they do not endanger public health, safety and order outside the installations. They shall notify the German authorities in good time of the extent to which they are departing from German regulations in the fields of public health and safety.
2. Where the authorities of the Forces do not themselves intend to implement within their installations applicable German regulations, they shall reach agreements with the competent German authorities which take into account equally military requirements and the requirements of the German administration.
3. Where buildings are partly occupied by (im Besitz) the Forces, the parts so occupied shall not be regarded as installations for the purposes of this Article if they are used as dwellings for members of the Forces.
4. The German authorities shall, upon request of the Forces, supervise or restrict in the vicinity of installations building activities and the movement of persons, animals, all types of vehicles, vessels, aircraft and balloons to the extent necessary, in the interest of common defence, for the effective operation of such installations and their security.