Earlier quoted context omitted.
There's probably a lot of this going. Comes to mind right now the way the Navy had about two seal teams in the beginning, and then decided to name the next one 'Team 6', to make it look like they had more. I've read about other examples, but can't remember right now.
"Delta Force" is not what it's called, either. The Army cycles through bureaucratic sounding names -- "Combat Applications Group" for example -- in order to keep it confusing. "Delta" comes from one of these names -- "Operational Detachment: Delta." This sounds like an unimportant support team for a Special Forces group. "OD: Alpha" is the main team of green berets (aka, "ODA" or "the A-Team"). They are supported by…
What you are likely confusing is "Seal Team 6", which is now properly listed as "United States Naval Special Warfare Development Group" or DEVGRU.