The Vietnam Swans hat outside the US Naval Academy in Annapolis

A Vietnam Swans hat has been seen outside the US Naval Academy in Annapolis, in the United States.

According to its website,

The Naval Academy was founded in 1845 by the Secretary of the Navy, George Bancroft, in what is now historic Annapolis, MD. The history of the Academy has often reflected the history of the United States itself. As the U.S. Navy has moved from a fleet of sail and steam-powered ships to a high tech fleet of nuclear-powered submarines and surface ships as well as supersonic aircraft, the Academy has changed also. The Naval Academy gives young men and women the up-to-date academic and professional training needed to be effective naval and marine officers in their assignments after graduation.

Former US President, Jimmy Carter was a graduate of the Academy.

It is unclear as to why a Vietnam Swans hat was present outside, rather than inside, the academy.