Every soldier who has ever deployed knows the ritual. You sit down alone, pen in hand, and you write the letter you hope will never be read. In The Wartime Principles of Mark Hertling in If I Don't Return, Lieutenant General (Ret.) Mark Hertling opens the drawer he has kept closed for decades — and shares what was inside. Written across multiple deployments, in field tents and forward operating bases far from home, these letters were addressed to his wife and children with a single devastating instruction: open only if I don't come home. He came home. But the letters stayed with him. And so did the principles they contained. This is not a conventional military memoir. There are no battle maps here, no tactical analyses, no institutional recounting of operations and objectives. What lives in these pages is something rarer and more lasting — the inner life of a soldier who was simultaneously a husband, a father, and a commander trying to reconcile those identities when they pulled in opposite directions and demanded incompatible things. Through sixteen deeply personal chapters, Hertling explores the wartime principles that shaped not just his command but his character — courage that requires speaking the truth when silence is safer, sacrifice that is only meaningful when freely chosen, loyalty forged in conditions that remove every comfortable option, and a definition of family that has nothing to do with geography and everything to do with the people you are willing to fight, suffer, and survive for. Honest about his failures. Unflinching about the cost. Quietly, powerfully certain about what mattered most. If I Don't Return is a book for soldiers and the families who waited for them. For anyone who has ever loved someone they were afraid of losing. And for every person who has sat down, in the grip of something urgent and true, and tried to find the words for what they most needed to say before the moment passed. The drawer is open now.