The Legion of the United States

The first professional army of the United States was called the "Legion of the United States":

http://en.wikipedia.org/wiki/Legion_of_the_United_States

The colors of the four sub-legions were as follows:

• 1st Sub-Legion: White and Black
• 2nd Sub-Legion: Red and White
• 3rd Sub-Legion: Black and Yellow
• 4th Sub-Legion: Green and White

If you will recall, the colors of the four horses of the Apocalypse are:

• White
• Red
• Black
• Green

A coincidence? Perhaps, but don't forget that these guys knew the Bible inside and out.

And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils were entered into him.

-Luke 8:30 KJV