Subtitle:Staff Sgt. Liam Dwyer, Sgt. Aaron Denning Reunited At Mazda RacewayStaff Sgt. Liam Dwyer and Sgt. Aaron Denning met under horrendous circumstances four years ago while serving with the U.S. Marines in Afghanistan. Dwyer left part of his left leg among extensive injures after stepping on an improvised explosive device....