In 2012, Sean Marquis was an infantry platoon leader—deployed to Dehqobad, Afghanistan—with a Stryker brigade. The boundary between the platoon's area of responsibility and that of an adjacent unit was a suspected transit route due—US force in the area called it the seam. As villages along the Arghandab River became increasingly restive, Sean set out to find a Taliban recoilless rifle known to be in the area. After reviewing the available information, Sean narrowed in on a nearby orchard as the likely hiding place for the weapon. Reinforced with sappers, Sean and his soldiers stepped off to patrol the seam. For Sean, it was also a developmental moment in his growth as an infantry officer.