A Pine Tree flag, a symbol originally from the Revolutionary ... U.S. flag code, which is not enforceable, specifies the Stars and Stripes should only be flown upside-down "as a signal of dire ...

E ighteen flags have billowed over the neat rows of plane trees in San Francisco’s Civic Center Plaza, among them a yellow “Don’t Tread on Me” flag, a Texas Lone Star flag and — until ...