The US had the largest navy during ww2
In 1914 the US had the third largest navy in the world. It ranked below the number one sized navy of Britain, and the second largest navy in 1914 was the German navy.
In the US Navy that rank is called Lieutenant jg. "Junior Grade"
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The Essex class of the US Navy were the largest carriers in WW2.
Great Britain had the largest navy in WW1.
The first official US Navy Base is the Washington Navy Yard. It was established in 1799.
USA had the second largest navy in wwi
A "Second Lieutenant" in the Army and Air Force element, or a "Sub-Lieutenant" in the Navy.
China has the largest if you count by "tonnage", although this does not automatically mean they have the most "powerful" navy. The US Navy is the most powerful in Asia, although it itself is not an Asian country.
"The United States navy is known to be the largest in the world. Even if the next seventeen forces in the list were combined, they do not stand equivalent to the United States navy. The budget of the US navy for the fiscal year 2008 is around $127.3 billion. Around 335,000 personnel are on duty in the US navy and there are around 128,000 personnel in held Reserve. Currently, the US navy operates on 280 ships and 3,700 aircraftsEven the world's prime carrier fleet with eleven carriers in service and two under construction is possessed by United States Navy." http://www.navioline.com/united-states-navy-world's-largest-navy.html
The Royal Australian Navy had the Fifth largest navy in the world at the begginning of World War 2.