Soldiers from the Navy or Coast Guard, The Great White Fleet?

There is no description on this real photo postcard. The stamp box reads: 'Velox, Place Stamp here'.  This style of stamp box was used from 1907 to 1917.

I asked a friend of mine who is in the Navy what she thought, here is her reply...

Definitely Navy.... Sometimes when they worked they would modify the uniform.. The "hat" is called a dixie cup and in this picture some have it flipped up like Popeye and others have it flipped down like a safari hat...

Also, a few of them tucked their bellbottom pants into their socks and boots to make it easier to work...

It looks like they may be in Australia with the origin natives... Aborigines... Im guessing on that one..

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On December 16, 1907 Teddy Roosevelt dispatched sixteen U.S. Navy battleships of the Atlantic Fleet on a worldwide voyage that lasted until February 22, 1909.  These ships would later come to be known as the Great White Fleet. On August 20, 1908 they landed in Australia.  I wonder if this postcard is from then????
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Here is a close up of one of the rifle in case anyone knows about these.  Maybe that can tell what year this was.