Arlington National Cemetery noted this week it is witnessing its first snowfall of the year with a series of photos that show quiet stillness and dignified respect.
Among the images were some of the Sentinels of the Tomb of the Unknown Soldier, who stand watch 24 hours a day, 365 days a year, in any weather.
The Tomb Guard marches exactly 21 steps down the black mat behind the Tomb, turns, faces east for 21 seconds, turns, and faces north for 21 seconds, then takes 21 steps down the mat and repeats the process. (The number 21 symbolizes the highest military honor that can be bestowed, the 21-gun salute.) Next, the Sentinel executes a sharp "shoulder-arms" movement to place the weapon on the shoulder closest to the visitors, signifying that he or she stands between the Tomb and any possible threat.
The Old Guard has stood its post at the Tomb continually since 1948.