Today in SF History: December 17

Today in Special Forces History:

1943: First OSS Operational Group recruits arrive in the UK. The Operational Groups were 15-man elements that foreshadowed the Special Forces Operational Detachment Alpha in their concept and construction. 

source: The Special Forces Regimental History Calendar, 1993. Special Forces Historical Society Research Organization, Seminole, FL, 1993. (privately printed)

The SFHS in turn credits the Office of Command Historian, USASOC, Fort Bragg, NC. 

The same information, uncredited, is online here. 

Many online sources and SF-community sources are being used to expand these posts. The online sources will be linked in the text.