Servants of the Light by Kris Alexander

An irreverent, scotch-swilling, skirt-chasing smartass, US Army Ranger Jake McPherson is more at home on the battlefield than stuck in his FOB. A brutal ambush in Iraq that threatens to wipe out his unit forces Jake to admit he possesses mental and physical powers most humans – including him – can only dream about. Using his powers to save his unit exposes Jake to the Chosen. An ageless order of evil dedicated to spreading chaos to create a world they can rule, the Chosen track Jake home to Texas, where a beautiful warrior – a Servant of the Light – saves Jake from their ruthless assassins. Reluctantly joining the ancient struggle, Jake masters his powers through the Servants’ bygone ways of combat. With modern weapons useless in a war between timeless adversaries, Jake has no choice but to rely on hand-to-hand combat, swords, and his wits. Jake must lead the Servants into battle from the across the US and back to Iraq, where the Servants learn the Chosen have claimed a weapon of unspeakable power ... a weapon only Jake and the Servants of the Light can stop from destroying the world as we know it.