Sgt. Maj. Adam Tweedel, native of Atlanta, and operations

Sgt. Maj. Adam Tweedel, native of Atlanta, and operations sergeant major of 67th Signal Battalion (Expeditionary), 35th Signal Brigade, blocks the canisters on his new M50 protective mask to ensure he has a proper seal before entering a gas chamber during the 67th ESB's fielding of the Soldier's newly issued M50 Joint Service General Purpose Masks at a training site on Fort Gordon, Ga., April 24. (U.S. Army photo by Sgt. Ashley M. Armstrong, 35th Signal Brigade Public Affairs/Released)