A lot of happenstance here.  I caught a British Airways Boeing 777 on final to Philadelphia International Airport passing by the flag at the main entrance to Fort Mifflin.  The fort was used during the Revolutionary War to try and protect Philadelphia from the British.  Now, they are flying over the walls daily.  The flag is similar to the one flying during the Battle of 1777 when the fort was destroyed in the attempt (rebuilding started in 1778).
Michael W Murphy
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/michaelwm25/10353454505/">https://www.flickr.com/photos/michaelwm25/10353454505/</a>