This week’s Marine Corps Times cover is an inspirational story about a Marine who competed in the 2010 Ironman World Championship after beating cancer not once, but twice. Staff Sgt. Clay Treska was diagnosed with stage-one testicular cancer in 2009, but beat the disease back with chemotherapy. The treatment that saved his life, however, also ravaged his body. He began packing on the pounds and edged in on 300 before deciding he was going to get back on track by training for an Ironman triathlon. After months of hard work, Treska who had no experience as an endurance athlete, was…