his father had died in a helicopter accident in southeast asia. only at age 29 when the air force declassified his father's story did he learn the truth. >> i was stunned that, in fact, he wasn't killed in a helicopter accident. it was the first time i knew of anything of his heroic deeds. >> reporter: during the vietnam war, the u.s. military wasn't supposed to be in laos. it was a neutral country. so etchberger and others shed their uniforms and posed as civilians to run a super-secret radar installation on a laotian mountaintop. in 1967 and '68, lima guided bombing of vietnam. in march of '68, north vietnamese soldiers scaled the tall cliff and attacked. the technicians were attacked. etchberger picked up an m-16. >> it's foggy.