The Tunnel to Towers Middle Tennessee 5K Run & Walk returns for its sixth year on Saturday at Warren County High School at 6 p.m. Volunteer Event Director Joe Clark expects this year's event to be the biggest one yet. "All of the proceeds go to the Tunnel to Towers Foundation to provide homes for catastrophically injured veterans, homeless veterans and to pay mortgages for surviving family members of first responders and the military who were killed in the line of duty," Clark said. To sign up, visit t2trun.org and select Middle Tennessee.