True Valor (Uncommon Heroes #2) by Dee Henderson

Air Force pararescueman Bruce "Striker" Stanton spends his life rescuing pilots downed behind enemy lines, and Grace Yates flies an F/A-18 Hornet for the Navy. On their dangerous jobs away from home, they exchanged love letters. Now a fight between Syria and Turkey over water rights on the Euphrates has spiraled into a confrontation NATO finds itself struggling to prevent. For the military deployed in the region, it's not just the occasional news headline-it's their daily problem. And when a missing Navy pilot turns out to be Gracie, Bruce has got one mission: get her out alive...