The 15 Most Secretive Units in U.S. Military History - History Collection
1. Delta Force (1st SFOD-D)
Image Source: Wikimedia Commons.
The 1st Special Forces Operational Detachment-Delta (1st SFOD-D), commonly known as Delta Force, is a premier counterterrorism and hostage rescue unit within the U.S. Army. Established in 1977 by Colonel Charles Beckwith, the...
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