US Army Command Sergeant Major Zack Carey (played by Garner) is about to retire from the military after taking his last post in rural Clemmons County, Georgia (loosely based on Fort Benning, largely in Chattahoochee County, Georgia). Despite being offered the possibility of becoming Sergeant Major of the Army, he insists he just wishes to finish his tour and retire in peace to spend time with his family. Several years earlier, his older son had been killed in an Army training accident, and his relationship with his only surviving son, Billy (played by Howell), is strained. Zack's no-nonsense, unpretentious style of leadership quickly earns him a reputation on-post as a tough but fair NCO, well-regarded for his compassion and integrity.