Staff Sgt. Chance Seidell walks behind a Stryker vehicle during a cordon and knock operation. U.S. Army Staff Sgt. Chance Seidell walks behind a Stryker vehicle during a cordon and knock operation outside of Sadar City, Iraq, on Dec. 24, 2006. Seidell is attached to Bravo Company, 1st Battalion, 23rd Infantry Regiment, 3rd Stryker Brigade Combat Team, 2nd Infantry Division. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 214173-O-NFL36-505.jpg Photo Gallery