The German Navy mans AA artillery in certain coastal forts. Except for being emplaced on permanent mounts, these AA guns do not differ materially from the normal Flak armament, and the same applies to AA guns on board ships. From the point of view of organization of rear-area defenses, it should be noted that the AA armament in these coastal forts, as well as the AA guns on board Navy ships undergoing repair or at rest in harbor, is used at need as a part of the AA ground defense of the immediate area.