United States Navy
The United States Navy was the naval branch of the United States military. The Navy was also responsible for aviation duties conducted from aircraft carriers. 

The United States Navy wore officer rank insignia somewhat similar to the 23rd century Starfleet, that being a series of sleeve stripes to denote rank. Starfleet and US Navy uniforms, however, are quite different in appearance. One 20th century observer once remarked "that's hardly a Navy uniform" when seeing a Starfleet uniform. ()

Benny Russell served in the Navy prior to 1938 where he wrote some of his earlier science fiction stories. () 

In an alternate timeline the San Francisco Bay was inadvertently visited in 1944 by Commander Charles Tucker III and Ensign Travis Mayweather in  of the starship . They witnessed that a substantial Navy Task Force, comprised of at least two aircraft carriers, had been gathered in the bay. ()

When USAF  John Christopher heard the name "", after being beamed aboard the ship in 1968, he mistook the starship for being a Navy vessel, before Captain Kirk corrected him, stating that UESPA was a "combined service." ()

In 1986, the aircraft carrier Enterprise was docked at the Alameda Naval Base in San Francisco. ()

The 24th century equivalent of the United States Navy was the Federation Naval Patrol. ()

Appendices

Background information 
Gene Roddenberry and his fellow producers used the real world US Navy as template for Starfleet when  was conceived and developed. (The Making of Star Trek; These Are the Voyages: TOS Season One, 1st ed, pp. 28-29) While a World War II United States Army Air Forces veteran himself, Roddenberry has declared to have always been "fascinated by the Navy" in a 1973 radio interview.   Incidentally, Roddenberry's right hand on the Original Series, Robert Justman had served in the US Navy during the war.

External links

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Earth military organizations