U.S. Marines wear gas masks while participating in a four-mile run during the 2011 Pfc. Ryan M. Jerabek Memorial Challenge on the flight deck aboard the amphibious transport dock USS Green Bay (LPD 20) under way in the Indian Ocean Aug. 20, 2011. Marines assigned to Battalion Landing Team, 1st Battalion, 1st Marine Regiment, 13th Marine Expeditionary Unit, and Sailors assigned to the ship honored Jerabek, a Green Bay native who died while supporting combat operations in Ramadi, Iraq, April 6, 2004.