For the first time in 84 years, the guard change at the Tomb of the Unknown Soldier in Arlington National Cemetery was conducted entirely by women on Friday.

The three women, members of the Old Guard, were selected for the prestigious vigil after intense training and a series of examinations.

'We commemorate the achievements of these trail-blazing Tomb Guards,' the Old Guard said in a statement, according to NBC News. '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,' it wrote, adding: '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.'