>> i thought, my god this is the same guy and the picture on the chart was not the same picture they ran on tv. >> atta used many names and nationalities and had many public photos in the years leading up to the attacks and this college picture, some describe it as a shy, considerate man. and, mary said she remembered him looking more like this and here's a picture, seared in our memories of the lead hijacker. while serving in afghanistan in 2003, lieutenant colonel schaeffer says he met and was ignored by the executive director of the 9/11 commission. >> it was stunned silence. >> reporter: listen to what a high ranking military officer told me in '05. about mohammed atta being identified at least one year before 9/11. >> i am telling you this, mohammed atta was 100%, no kidding, i would go to my grave swearing that he was on the picture. >> reporter: a year later after public hearings the defense department officially jeereject