PENSACOLA, Fla. (AP) — Nashville songwriter Bob Regan has written hit songs for well-known stars including Keith Urban, Trisha Yearwood and Tanya Tucker. But those songs aren't the ones that have meant the most to the Grammy-nominated artist. Regan is proudest of dozens of songs that will likely never become mainstream hits — songs of pain and loss written by combat veterans through Operation Song, a nonprofit organization he created to connect veterans with professional songwriters. "The veterans bring the stories and we bring the songwriting experience.