A mask, painted by a Marine who attends art therapy to relieve post-traumatic stress disorder symptoms, is displayed at an art expo May 3. The expo provided a way to raise awareness about PTSD and the benefits of art therapy. During therapy sessions, participants use a variety of art supplies, including paints, clay, markers, charcoal and images for collages, to express their thoughts, feelings and memories. (Official U.S. Marine Corps photo by Cpl. Andrew Johnston) - A mask, painted by a Marine who attends art therapy to relieve post-traumatic stress disorder symptoms, is displayed at an art expo May 3. The expo provided a way to raise awareness about PTSD and the benefits of art therapy. During therapy sessions, participants use a variety of art supplies, including paints, clay, markers, charcoal and images for collages, to express their thoughts, feelings and memories. (Official U.S. Marine Corps photo by Cpl. Andrew Johnston)