From Wiki:
Billy Jack is a "half-breed" American Cherokee Indian Green Beret Vietnam War veteran, hapkido master, and gunslinger. The character made his début in The Born Losers (1967), a so-called "biker film" about a motorcycle gang terrorizing a California town; Billy Jack rises to the occasion to defeat the gang by defending from their wrath a college student who has evidence against them for gang rapes. The first film was considered the typical drive-in theatre fare of the period, described by Entertainment Insiders reviewer Rusty White as "pure exploitation, but with something extra."
http://en.wikipedia.org/wiki/Billy_Jack