captain derek herrera, in the wheelchair. his 4-year-old twins watching. whoa! they watch as their father stands up for the first time, he does it in front of them. dad, you re tall! you re walking! yeah! hudson and hunter amazed. are you walking? i m about to. what do you think? tall! we have followed captain herrera for years. leading his team 0 patrol in afghanistan, he was shot by a sniper in 2012. paralyzed from the chest down. afterward, the grueling recovery. the rehab. and that moment at bob woodruff s standup for heroes when captain herrera was about to walk across the stage with rewalk, exoskeleton technology. i forgot what walking was like. you re going to surprise the audience. yes. and he did it. this time, standing up before