Hallowed Ground by Rebecca Yarros

Josh Walker, a loyal and reckless dreamboat, has always had eyes for December Howard, the girl who captured his heart during their high school hockey days. Despite enduring grief, military service, distance, and time, they fought for stolen moments between Josh’s post at Ft. Rucker and Ember’s studies at Vanderbilt. Now, as Josh becomes a medevac pilot and Ember approaches graduation, they are taking the next step by moving in together.

Ember never desired an Army life, but her love for Josh requires accepting the army’s demands, even when it means saying goodbye as he departs for Afghanistan—a country that nearly claimed his life before and took her father as well. Though they fill their remaining days with love, passion, and plans for their future, Ember’s fear persists. Having learned from her father’s death, she knows there are obstacles even love cannot conquer.

Flight school has ended.

This is war.