Terry Gross

Michelle Shephard has traveled to Guantanamo Bay, Cuba, more than two dozen times and has been following the stories of men who've been released from the U.S. detention center. She's the author of Guantanamo's Child and Decade of Fear: Reporting From Terrorism's Grey Zone.

Colbert loves music and loves to sing, so Fresh Air's Terry Gross asked him to bring a few songs that mean a lot to him and tell her why.

In the early days of the Iraq War, during a firefight in Baghdad, Lu Lobello's Marine unit mistakenly opened fire on a family of civilians, killing three. Years later, and after enlisting the help of reporter Dexter Filkins, Lobello reached out to that family for forgiveness.