(Photo Credit: Matthew Larotonda/ABC News)

ARLINGTON, Va. - A new "Living Wall of Honor" at the Arlington National Cemetery women's memorial remembers the U.S. service members who died in the Iraq and Afghanistan wars after the terror attacks of Sept. 11, 2001. It was unveiled today, the attacks' 13th anniversary.

The unique memorial is a stunning arrangement of over 700 indoor plants, but 160 slots were left empty, one for each death. Volunteers and families then filled those cases with saplings, each bearing a photo of the honored dead. A veteran's glee club resonated in the chamber.

"Nothing like this has ever been done before. There's never been an organic memorial to our post-9/11 veterans," Kristina Kaufmann of the Code of Support Foundation told ABC News.

The charity network helped organize the tribute.

"We're honoring the fallen with the living; honoring the dead with the living. And that's really what this is with these plants."

Among them is Army Spc. Toccara Green, who received a Gold Star for her sacrifice in Iraq in 2005. Her parents, Gary and Yvonne Green, reflected on what it was like looking back nearly a decade later.

"After nine years, she had passed away, people still come out and support her," Gary Green said. "And that makes me feel that her life was not, lost in vain. It really helps me out psychologically, so I really appreciate it."

Added Yvonne Green: "Even though her life isn't physically here, these plants are symbolic of the life she lived. They forever grow and continue to blossom on into more life."