United States military uniform
United States military uniforms were the uniforms originally worn by the military forces of Earth's United States from approximately the 19th century and 20th century.

Army 
Examples of United States Army uniforms. (; ; ; ; ; ; )

Marine Corps 
Examples of United States Marine Corps uniforms. (; )

Navy  
Examples of United States Navy sailor uniforms. (; ; )

After time travelling through the Guardian of Forever and meeting Edith Keeler in 1930 Earth, Doctor Leonard McCoy introduced himself to her, explaining that he was the "senior medical officer aboard the ." Taking that in, Keeler, upon viewing his , replied, "I don't mean to disbelieve you, but that's hardly a Navy uniform." ()

Air Force 
Examples of United States Air Force uniforms. (;  opening title sequences)

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Earth
Uniforms