Spc. Patricia Mathis, 506th Quartermaster Company, 18th Combat Sustainment Support Battalion, 16th Sustainment Brigade, performs the cross-collar choke on an opponent during the Sustainer Challenge competition at Joint Base Balad, Iraq, March 19. Mathis, a native of Philadelphia, Pa., said it is important to challenge yourself. "Do not be terrified and do not be discouraged," said Mathis. "Just have faith in yourself and you can accomplish anything you put your mind into."