As the Tomb of the Unknown Soldier prepares to mark 100 years at Arlington National Ceremony, a historic first came about Friday throughout a guard change.

“For the first time in the 84-year-vigil, on the 30,770th day of continuous guarding, an all-female guard change occurred with the 38th Sergeant of the Guard,” the Old Guard tweeted. 

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“We commemorate the achievements of these trail-blazing Tomb Guards,” the Old Guard acknowledged on social media. “While this historic event may be a first, it is not the last. With diversity in our ranks, race, gender, or any characteristics will never hinder, but only enhance the execution of our sacred mission. As we recognize this monumental day, we reflect on the Unknowns and their ultimate sacrifice. The world will never know their names. Their life’s poetry was silenced in the defense of this great nation. We will never forget their sacrifice, and we will never falter as our standard will remain perfection.”

During this time of the yr, the army guard on the Tomb of the Unknown Soldier is modified in an elaborate ceremony which occurs each hour on the hour from October 1 via March 31, and each half hour from April 1 via September 30.

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Twenty-four hours a day, troopers from the third U.S. Infantry Regiment, often known as “The Old Guard,” stand watch over the Tomb. The Tomb Guards, additionally referred to as “Sentinels,” are chosen for this prestigious and extremely selective submit solely after rigorous coaching and a demanding collection of examinations. The Old Guard has held this distinguished responsibility since 1948.  

On November 11, 1921, the Unknown was positioned on a horse-drawn caisson and carried in a procession via Washington, D.C. and throughout the Potomac River. A state funeral ceremony was held at Arlington National Cemetery’s new Memorial Amphitheater, and the Unknown was interred within the Tomb of the Unknown Soldier, based on the Arlington National Cemetery website.

Arlington National Cemetery is planning a public celebration of the one centesimal anniversary of the Tomb of the Unknown Soldier for Veteran’s Day. The hashtag #Tomb100 is already getting used throughout social media platforms to mark the event.