Thanks for talking for "nobody" as they are an underrepresented group on this site, but the reality remains that in no way could a "Security Force" be interpreted to mean the Peace Corps except by the most spectacular bathwater sippers ever brought to bear.
That "interpretation" is a desperate attempt to find some reason for this insanity.
Well, that's all well and good, but what he said was a "national security force" and what is clear from the speech and his campaign generally is that he takes a much wider view of "national security" than your narrow, myopic use of the term.
In short, "national security" means a whole hell of a lot more than you want to pretend it does.