Five months after stepping on an explosive in Afghanistan and losing both legs, Staff Sgt. Charles “Chaz” Allen returned home over the weekend to a hero’s welcome, greeted by hundreds at the airport and hundreds more the next day at a fundraiser in his honor.“This has all been incredible,” said Allen of his return to Clarksville after months of treatment and rehab at Walter Reed Medical Center in Washington D.C. “I can’t really put into words how much I appreciate all the people who came out to welcome me home and hug my neck.”Allen, 32, was on patrol looking for improvised explosive devices in January when one detonated under his feet, the third time he had walked across that same piece of ground. Allen said he knew immediately he had lost both legs given the force of the explosion.“It threw me for a back flip,” Allen said, noting his first fear was not for his survival but that the blast had killed others. “I’m glad it was just me.