161110-N-UD775-399 WILLIAMSBURG, Va. (Nov. 10, 2016) U.S. Sailors with Navy Cargo Handling Battalion One, Navy Expeditionary Logistics Support Group, Navy Expeditionary Combat Command conduct training on their gas masks onboard Naval Weapons Station Yorktown, Cheatham Annex. Sailors assist each other in the operations and fitting of gas masks in preparation to enter the gas chamber to gain confidence in their mask. (U.S. Navy photo by Seaman Malinao/Released)