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United States Navy (usually, but can be any nation's fleet). The Navy is the sea-based branch of the military, but through the use of aircraft carriers they have taken over much of what the Air Force used to do. Because of this they are possibly the most prominent and widely-used of all the branches of the U.S. military (same goes for most other nations too). Tactically, their primary focus is blue-water operations such as fleet and subarmine warfare, but since the Cold War this role has been de-emphasized as most countries with any respectable naval forces arent dumb enough to piss off the USA.

Their role in combat operations will likely only continue to increase as everyone loves a "clean" air war. However, because they do not have a true ground force anymore they are not self-sufficient and must work very closely with the Army/Marines during combat operations.
The Army and Marines move in to take over territory after the Navy and Air Force have turned it into a big smoking crater.
by Bogus January 27, 2005
The Navy is not gay. Army started this rumour because they always lose to Navy in the Army/Navy football game
Army guy #1: Wow Navy just kicked our asses

Army guy #2: Well the're gay

Army guy #3: Thats funny. Let's spread that
by GO NAVY!!! August 30, 2004
The branch of many modern militaries, especially the United States military, that specializes in sea-based operations and has a wide jurisdiction over military command.
Danno enlisted in the Navy.
by Nicolaivich January 19, 2004
An excellent branch of military that focusses on water-related operations often involving warships and submarines. Any large country with a water borderline MUST have a Navy and a Coast Guard. Some people make fun of the Navy, calling the Navy members gay. but these people are actually gay themselves and uncomfortable with their manhood in fear that these Navy guys are much stronger, tougher, smarter and more virile than them.
The British Royal Navy helped Britian conquer the world.

The Navy is full of smart, strong and brave men and women.
by Yusuf May 09, 2004
Acronym for never again volenteer yourself.
they can make it harder but only you can make it longer.
by Bear July 29, 2003
A branch of the military which is just as valuable as any other one.
Making fun of the Navy is a common pasttime of men with small penises.
by Ryan January 31, 2004
The finest branch of the United States Military. Even though people question the need for a Navy in modern era, but the fail to recognize its abilities.

Provides long-range, heavy artilery fire for land and amphibious units

Provides forward operations and launch point for aircraft

Transports those damned Marines

And need I mention the SEALs and SWCCs?
I joined the navy so I could become a SEAL. After all, they are the best in the world.
by Harrison C October 13, 2005
The United States Marine Corps is part of the Navy, in response to the guy that said that the Navy no longer has ground forces.
The Navy transports the Marines because the Marines are part of the Navy.
by kabighter June 08, 2006