Carrie Underwood is performing at the Concert for Valor on Tuesday (Nov. 11), and in honor of Veterans Day, she has shared an emotional story about how one special military family changed how she sings one of her own songs.

In her career, Underwood has worked extensively with the military, performing for troops around the world.

"I’ve done everything from touring with the USO in Iraq and Kuwait, to playing shows at military bases in the U.S., to writing songs for special projects used to benefit our military members and their families," she writes in a special piece for Time. "I’ve met countless brave souls that sacrifice their time and effort to keep us safe here at home. And I’ve met many spouses and children of those who don’t make it back home. Those are the stories that I could never and would never want to forget."

One of those stories involves her hit song 'See You Again,' which she co-wrote with Hillary Lindsey and David Hodges. The track appeared on Underwood's 2012 album 'Blown Away' and was a Top 10 single. The lyrics have a powerful message.

"To many it’s a song about moving on after the death of a loved one -- about wanting to see that person again, and knowing that eventually they will," Underwood writes. "But I never dreamed that so many would relate to it in such a powerful way."

The superstar says fans had an overwhelming reaction to the song, approaching her at shows or even on the street to tell her how long their spouses had been deployed and how the song brought comfort in their absence.

"Some of the stories, however, wouldn’t have such a happy ending. I remember talking to one brave girl and her mother," the singer continues. "They had bought tickets the second they went on sale for the whole family to come to my show. The girl’s father was supposed to be home from deployment by the time the show rolled around. Tragically, he never made it."

Underwood got word that the mother and daughter still wanted to attend the show, and she arranged to meet them.

"The mother told me the story that I already knew, and told me how much 'See You Again' meant to them. I could tell that they both had amazing faith that the most important man in their lives was looking down on them and waiting for them. I guess hearing it in a song solidified that belief a little more," the star shares.

"I am still amazed at how strong they both were. They might have found a little comfort in one of my songs," she adds, "but because of their story and the many others like it that I have heard since, I’ll never sing that song the same way again."

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