Blue Light Unit
The Blue Light unit was started in 1977 as a counter terrorist unit to fill in the US Military's gap in this capability until Delta was operational. Made up of primarily Vietnam Special Forces veterans, their mission set was focused on hostage rescue. It was becoming more and more clear a unit with the capabilities of the 22 SAS Regiment and Germany's GSG-9 was desperately needed, hence why Delta was given the go. Although Deltas MOS was built using SAS training and tactics, Blue Light was not. During this time there was infighting in the Army over the two units. In the end Delta was and is the Tier 1 counter terrorist unit.


https://home.army.mil/stewart/units/tenant-units/3-160-soar