What is the difference beteen Deltas, Navy Deals, Green Beret etc etc..

ok. The answer to your questions are contained in a weeklong course in Tampa, a series of books, or those who have been attached to a SOF unit.



Air Force
- 160th “Night Stalker” Special Operation Aviation Regiment - 'special' pilots with 'special' aircraft to fly SOF operators around the world. They also train medics to HALO jump into a fight to provide EMT and life saving measures

Navy
- SEALs - maritime special operations. They specialize in direct action, special reconnaissance, and underwater unconventional warfare and can infiltrate and operate from the sea, air, and land.

Army
- 75th Ranger Regiment - specialize in combat missions that involve insertion of relatively large units into hostile territory
- Army Special Forces (Green Berets) - specialize recruiting, organizing and training local forces; and accompanying or leading them in combat operations supporting U.S. objectives
- Special Forces Operational Detachment D (Delta Force) - focuses on direction action counter-terrorist missions such as hostage rescue and capture or killing of high value targets, as well as protection of high-ranking individuals


"Varsity Level" SOF (Tier 1 units)
- Delta Force - https://nationalinterest.org/blog/buzz/secret-now-out-how-delta-force-was-born-62282
- DEVGRU (SEAL Team 6) - https://nationalinterest.org/blog/buzz/what-makes-seal-team-6-so-dangerous-213825
- Ranger Regimental Reconnaissance Company
- Intelligence Support Activity
- 24th Special Tactics Squadron

That said, here is an article that breaks it all down for you in just a few minutes worth of reading: https://nationalinterest.org/blog/reboot/confused-all-us-special-forces-heres-guide-192216

I know the Seals are trained to swim arduous waters which means that can be dropped off in arduous ocean waters for a surprise attack such as in 1983 Grenada. Some don’t make it to shore.

Aside from whats already been said about each branch having its own Special Ops team(s), Im not sure how its determined which one gets a specific mission. There are most likely particulars involved where one team has a specific skillset, or some other factor.

Army & Navy were the two original military branches. The Marines were branched off the Navy and the Air Force was branched off the Army. This is why you will sometimes see reference to the Army Air Corp (prior to the Air Force being an independent branch it was the Army Air Corp).

Yes they have different specialty
Delta being told get the job done but if caught we dont know you 150-1 kill seals and green one army the other navy night stalker air force

I suppose the way they pick is what a certain group is trained for
(Certain types of situations)

each military branch has its own special forces

Each has their own speciality. They also "belong" to different branches within the military