1 Jul 1937
- In compliance with an order of the Navy Department, all United States Marine Corps Reserve tactical squadrons were designated as scouting squadrons. ww2dbase [CPC]
- Martin Niemöller was arrested. ww2dbase [Martin Niemöller | CPC]
- The keel of U-40 was laid down by Deutsche Schiff- und Maschinenbau AG in Bremen, Germany. ww2dbase [Deutsche Schiff- und Maschinenbau AG | U-40 | Bremen, Weser-Ems | CPC]

1 Jul 1937 Interactive Map
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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