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Annie Glenn, seated, widow of John Glenn, watches as members of the U.S. Marine Corps carry the casket of her husband during his graveside service. (U.S. Army photo by Rachel Larue/Arlington National Cemetery/released)

 
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Members of the U.S. Marine Corps and the U.S. Army Caisson Platoon, part of the 3d U.S. Infantry Regiment (The Old Guard), participate in the graveside service for John Glenn. (U.S. Army photo by Rachel Larue)

 
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Commandant of the Marine Corps Gen. Robert B. Neller, left, speaks with Annie Glenn, widow of John Glenn, during the graveside service for John Glenn at Arlington National Cemetery, April 6, 2017. (U.S. Army photo by Rachel Larue)

 
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Commandant of the Marine Corps Gen. Robert B. Neller, left, presents the American flag to Annie Glenn, widow of John Glenn, during the graveside service at Arlington National Cemetery, April 6, 2017. (U.S. Army photo by Rachel Larue)

 
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Commandant of the Marine Corps Gen. Robert B. Neller, left, presents the American flag to Carolyn Glenn, daughter of John Glenn, during the graveside service in Section 35 of Arlington National Cemetery. (U.S. Army photo by Rachel Larue)

 
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Commandant of the Marine Corps Gen. Robert B. Neller, left, salutes Annie Glenn, widow of John Glenn, following the American flag presentation during the graveside service for John Glenn. (U.S. Army photo by Rachel Larue)

 
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Members of the U.S. Marine Corps participate in the graveside service for John Glenn in Section 35 of Arlington National Cemetery, April 6, 2017 (U.S. Army photo by Rachel Larue)

 
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Members of the U.S. Marine Corps, from Marine Barracks Washington, participate in the graveside service for John Glenn at Arlington National Cemetery. (U.S. Army photo by Rachel Larue)

 
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Marine Sgt. Christian Rangeo, bugler with the U.S. Marine Drum and Bugle Corps, plays Taps during the graveside service for John Glenn at Arlington National Cemetery. (U.S. Army photo by Rachel Larue)

 
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Members of the U.S. Marine Corps, from Marine Barracks Washington, participate in the graveside service for John Glenn at Arlington National Cemetery. (U.S. Army photo by Rachel Larue)

 
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Members of the U.S. Marine Corps, from Marine Barracks Washington, participate in the graveside service for John Glenn at Arlington National Cemetery. (U.S. Army photo by Rachel Larue)

 
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Members of the U.S. Marine Corps, from Marine Barracks Washington, participate in the graveside service for John Glenn. (U.S. Army photo by Rachel Larue)