Chaplain (Maj. Gen.) Thomas Solhjem, U.S. Army chief of chaplains, and Chaplain (Col.) Joseph M. Fleury, Joint Base Myer-Henderson Hall senior Catholic chaplain, place the first flag at the headstone of Maj. Charles Joseph Watters during the Flags In tribute on Chaplains Hill at Arlington National Cemetery, May 27, 2021. (Paul Stamps)

Chaplain (Col.) Joseph M. Fleury, Joint Base Myer-Henderson Hall senior Catholic chaplain, leads a prayer during the Flags In tribute on Chaplains Hill at Arlington National Cemetery, May 27, 2021. (Paul Stamps)

Chaplains and religious affairs specialists from across the Military District of Washington gathered May 27, 2021, at Chaplains Hill, where they honored the fallen buried in Section 2 of Arlington National Cemetery by placing flags at their gravesites prior to Memorial Day weekend in a tradition known as Flags In.

Chaplains and religious affairs specialists from across the Military District of Washington gathered May 27, 2021, at Chaplains Hill, where they honored the fallen buried in Section 2 of Arlington National Cemetery by placing flags at their gravesites prior to Memorial Day weekend in a tradition known as Flags In.

Chaplains and religious affairs specialists from across the Military District of Washington gathered May 27, 2021, at Chaplains Hill, where they honored the fallen buried in Section 2 of Arlington National Cemetery by placing flags at their gravesites prior to Memorial Day weekend in a tradition known as Flags In.

Chaplain Mendy Stern pays tribute to a fallen service member during "Flags In" on Chaplains Hill at Arlington Cemetery, May 27, 2021.

Chaplain (Brig. Gen.) Andrew Harewood, U.S. Army Reserve deputy chief of chaplains, places a flag at the headstone of a fallen service member during the Flags In tribute on Chaplains Hill at Arlington National Cemetery, May 27, 2021.

ARLINGTON, Va. -- Chaplains and religious affairs specialists from across the Military District of Washington gathered May 27 at Chaplains Hill, where they honored the fallen buried in Section 2 of Arlington National Cemetery, by placing flags at their gravesites prior to Memorial Day weekend, in a tradition known as Flags In.

Chaplain (Maj. Gen.) Thomas Solhjem, U.S. Army chief of chaplains, and Chaplain (Col.) Joseph M. Fleury, Joint Base Myer-Henderson Hall senior Catholic chaplain, place the first flag at the headstone of Maj. Charles Joseph Watters during the Flags In tribute on Chaplains Hill at Arlington National Cemetery, May 27, 2021. (Paul Stamps)

Chaplain (Maj. Gen.) Thomas L. Solhjem, U.S. Army chief of chaplains, and Chaplain (Col.) Joseph M. Fleury, Joint Base Myer-Henderson Hall senior Catholic chaplain, place the first flag at the headstone of Chaplain (Maj.) Charles Joseph Watters, who served in Vietnam and posthumously received the Medal of Honor for his selfless actions on Nov. 19, 1967.

For over 60 years, the 3d U.S. Infantry Regiment (The Old Guard) has honored America's fallen heroes days prior to Memorial Day by placing small American flags in front of more than 265,000 headstones, as well as at the bottom of niche rows in the cemetery's Columbarium Courts and Niche Wall. Each flag is inserted into the ground, exactly one boot length from the headstone's base.

For over 60 years, the 3d U.S. Infantry Regiment (The Old Guard) has honored America's fallen heroes days prior to Memorial Day by placing small American flags in front of more than 265,000 headstones, as well as at the bottom of niche rows in the cemetery's Columbarium Courts and Niche Wall. Each flag is inserted into the ground, exactly one boot length from the headstone's base.

For over 60 years, the 3d U.S. Infantry Regiment (The Old Guard) has honored America's fallen heroes days prior to Memorial Day by placing small American flags in front of more than 265,000 headstones, as well as at the bottom of niche rows in the cemetery's Columbarium Courts and Niche Wall. Each flag is inserted into the ground, exactly one boot length from the headstone's base.

U.S. Army chaplains place flags in front of the headstones and four memorials located on Chaplains Hill in Section 2 at Arlington National Cemetery.

U.S. Army chaplains place flags in front of the headstones and four memorials located on Chaplains Hill in Section 2 at Arlington National Cemetery. The memorials honor the chaplains killed in World War I; Protestant chaplains killed in World Wars I and II; Catholic chaplains killed in World War II, Korea and Vietnam; and Jewish chaplains killed while on active duty.

U.S. Army chaplains place flags in front of the headstones and four memorials located on Chaplains Hill in Section 2 at Arlington National Cemetery. The memorials honor the chaplains killed in World War I; Protestant chaplains killed in World Wars I and II; Catholic chaplains killed in World War II, Korea and Vietnam; and Jewish chaplains killed while on active duty.

U.S. Army chaplains place flags in front of the headstones and four memorials located on Chaplains Hill in Section 2 at Arlington National Cemetery. The memorials honor the chaplains killed in World War I; Protestant chaplains killed in World Wars I and II; Catholic chaplains killed in World War II, Korea and Vietnam; and Jewish chaplains killed while on active duty.

Army chaplains place flags in front of the headstones and four memorials located on Chaplains Hill in Section 2. The memorials honor the chaplains killed in World War I; Protestant chaplains killed in World Wars I and II; Catholic chaplains killed in World War II, Korea and Vietnam; and Jewish chaplains killed while on active duty.

All flags are removed after Memorial Day.