As far as I know, this guy didn't claim anything of (monetary) value...
...but his mere lying about his military deeds and achievments stoked the antiwar movement and jeopardized real Rangers and other soldiers.
The only reason his subsequent lies had any credibility is because of his claims to certain military achievments.
IMHO, the lies he used to gain entrée to the media and to become the darling of the anti-war crowd should, in and of themselves, be prosecutable.