An excellent read for anyone interested.

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The internet has no shortage of basement-dwelling commandos beating at their keyboards like chimpanzees as they forcefully insist upon one incorrect factoid or another regarding Special Operations units. All SEALs are considered Tier One, right?

No. Rangers pull security for Delta, correct? Time to throw away that scratched-up "Black Hawk Down" DVD, hero.

Since the internet stupidity goes on and on, two people at Sofrep decided to team up to write a definitive article about the differences between SEALs and Rangers. This article was written by Brandon Webb, who served in SEAL Team Three, and Jack Murphy, who served in the 3rd Ranger Battalion.

SEa Air Land. It always amazes me how many people that acronym is lost on. They think water, Navy, and marine mammal.
History

The history of the modern SEAL team dates back to the 1940s and World War II. They began as the Navy construction and demolition units and then saw a transformation with Draper Kauffman (great story here) and the Underwater Demolition Teams. John F. Kennedy would officially welcome the first SEAL teams: SEAL teams one and two in the 1960s. The US military desperately needed a maritime Special Operations fighting force; the SEALs were the answer. Come from the water and fight on land or sea.

http://www.businessinsider.com/diffe...egiment-2015-9