Maybe.....in 1960/61 when the US special forces training centers were expanded one Paul Vann recruited several martial arts experts to train recruits. In those days martial arts was almost unheard of and the great karate/Kung Fu/ TaikwanDo boom in the USA didn't happen until the late 1960s/ 1970s. Paul Vann was a CIA/army liaison officer. he is the central character of "A Bright and Shining Lie".
My family does TaikwanDo (those of you who are my friends on facebook can see me getting my butt kicked in the photos section). Our Grandmaster, Grandmaster Lee is now 81 (same age as Khan), looks younger than me and can do 1000 (!) push ups at a time.
Grandmaster Lee began his training as a Korean conscript into the Imperial Japanese army, deserted when the Russians invaded and later fought in the Korean war.
He too was employed from 1965-1970 by the US army....as a martial arts instructor.
I think it is quite possible that Mr. Khan there is a puffed wannabee, but he may also be one of the original army/CIA martial arts trainers. That would make sense.
Any chance one of our members can meet and talk to him?