Arborist Mark Trautman, who worked to recover the debris from the hijacked United Airlines Flight 93 near Shanksville, poses for a portrait in his tree climbing gear outside his home in Spruce Creek, Pennsylvania, September 2, 2021.

Arborist Mark Trautman, who worked to recover the debris from the hijacked United Airlines Flight 93 near Shanksville, poses for a portrait in his tree climbing gear outside his home in Spruce Creek, Pennsylvania, September 2, 2021.

Mark Trautman holds his badge from when he was on site during 9/11 at his home in Spruce Creek, Pennsylvania, September 2, 2021.

Mark Trautman holds his badge from when he was on site during 9/11 at his home in Spruce Creek, Pennsylvania, September 2, 2021.

Arborist Ben Haupt, who worked to recover the debris from the hijacked United Airlines Flight 93 near Shanksville, poses for a portrait in his tree climbing gear at his home in Spring Mills, Pennsylvania, September 2, 2021.

Arborist Ben Haupt, who worked to recover the debris from the hijacked United Airlines Flight 93 near Shanksville, poses for a portrait in his tree climbing gear at his home in Spring Mills, Pennsylvania, September 2, 2021.

Flowers are seen at the Flight 93 National Memorial near Shanksville in Stoystown, Pennsylvania, August 31, 2021.

Flowers are seen at the Flight 93 National Memorial near Shanksville in Stoystown, Pennsylvania, August 31, 2021.

(L-R) Mark Trautman and Ben Haupt pose for a portrait in Stoystown, Pennsylvania, September 2, 2021.

(L-R) Mark Trautman and Ben Haupt pose for a portrait in Stoystown, Pennsylvania, September 2, 2021.

Three of arborist Ben Haupt's (not pictured) children, Jeremiah Haupt, 8, Ben Haupt Jr., 12, and Janelle Haupt, 14, build a fire outside their home in Spring Mills, Pennsylvania, September 2, 2021.

Three of arborist Ben Haupt's (not pictured) children, Jeremiah Haupt, 8, Ben Haupt Jr., 12, and Janelle Haupt, 14, build a fire outside their home in Spring Mills, Pennsylvania, September 2, 2021.

John Larsen, who worked as an FBI special agent when the hijacked United Airlines Flight 93 crashed near Shanksville, poses for a portrait at his home in Glen Ellyn, Illinois, September 5, 2021.

John Larsen, who worked as an FBI special agent when the hijacked United Airlines Flight 93 crashed near Shanksville, poses for a portrait at his home in Glen Ellyn, Illinois, September 5, 2021.

(L-R) Arborists Mark Trautman and Ben Haupt along with two Haupt's daughters, June Haupt, 16, and Janelle Haupt, 14, look out at the hemlock grove in Stoystown, Pennsylvania, September 2, 2021.

(L-R) Arborists Mark Trautman and Ben Haupt along with two Haupt's daughters, June Haupt, 16, and Janelle Haupt, 14, look out at the hemlock grove in Stoystown, Pennsylvania, September 2, 2021.

Arborist and preacher Ben Haupt poses for a portrait at Grace Baptist Church in Spring Mills, Pennsylvania, September 2, 2021.

Arborist and preacher Ben Haupt poses for a portrait at Grace Baptist Church in Spring Mills, Pennsylvania, September 2, 2021.