PHILADELPHIA — George Washington’s personal Revolutionary War headquarters flag is going on display at Philadelphia’s Museum of the American Revolution, just in time for Flag Day. The faded and fragile blue silk flag marked Washington’s presence on the battlefield during the war, and its appearance at the museum is the flag’s first public display in Philadelphia since the war. The museum is bringing the flag, known as the Commander-in-Chief’s Standard, out of its archives for public viewing from Thursday through Sunday. It features 13 white stars on a blue background, representing the 13 colonies. “Revolutionary Americans adopted various symbols to represent the new republic that they created after the Declaration of Independence,” said Dr.