A spokesman for the Third U.S. Infantry Regiment, which is responsible for guarding the tomb, told the Associated Press that when the cemetery closes due to weather, the guard continues, but it's not the choreographed 21-pace that the public sees. Instead, soldiers guard the tomb from a small enclosure covered by a green awning about 20 feet away. If the weather becomes too dangerous, the tomb can be guarded from a room inside a nearby amphitheater. But the AP said no such order had been given as of Monday afternoon. The Tomb of the Unknowns holds the remains of unidentified soldiers from World Wars One and Two and the Korean War. Sentinels have kept it under continuous guard since 1948.
This photo that was making the Internet rounds on Monday showed three of the Tomb of the Unknowns sentinels standing their posts in driving rain. It turns out however that the photo, though stirring, was taken during a September storm.