31 May 1931
- Cruiser Köln conducted training operation in the Baltic Sea. ww2dbase [Köln | CPC]
- Reinhard Heydrich joined the Nazi Party in Hamburg, Germany, receiving party identification number 544,916. ww2dbase [Reinhard Heydrich | Hamburg | CPC]
Timeline Section Founder: Thomas Houlihan
Contributors: Alan Chanter, C. Peter Chen, Thomas Houlihan, Hugh Martyr, David Stubblebine
Special Thanks: Rory Curtis
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