Volume IIB is the second volume relating to (and completing) the Wehrmacht, and the German mobilisation and war-economy, from June to December 1941. It includes the most detailed Orders of Battle ever published on the German Heer, Luftwaffe, Waffen SS and Kriegsmarine, in all areas of the Reich, between 22nd June and 4th July 1941. Even small and obscure units are included, such as: flak companies, artillery HQs, observation battalions, bridging columns, Landesschutzen battalions, MP battalions, railroad companies, and Luftwaffe Kurierstaffeln, Verbindungsstaffeln and Sanitatsflugbereitschaften. The Luftwaffe OOBs also include details on aircraft types and strengths in each air unit.