Retired USMC Col. Tim Grattan had a 25 year long career in the Marine Corps spanning from 1990-2015. During that time he commanded Marines on combat deployments to Somalia, Iraq, and Afghanistan. In 2009 he was my battalion commander for 2nd Light Armored Reconnaissance Battalion during a major offensive operation in the Helmand Province of Afghanistan. Tim shares his lessons and insights about his many leadership roles over his 25 year career, how he had to adapt to each new challenge, what he learned along the way, and how he faced the struggles of transitioning to the civilian world.