Just remember that the Airborne troops ride in Air Force aircraft. The Security Forces in the Air Force have taken on the role of the soldiers whose job it was to man the perimeter of the base so they can go out and get the crap kicked out of them. The folks in the AF aren't dumb, they know who's on the winning end of the deal.
In all seriousness, I left the cop side of the house and went into combat arms because the Air Force wanted to make cops infantrymen above all else. The problem with that is that the AF is not traditionally a ground combat force. Because of this the SF (security forces) are not taken seriously anymore, basically get crapped on and hate their jobs. There are more factors involved here (people failing out of other schools being dumped into SF) etc., that contribute. But when Big Air Force started treating SF like shit, they got what they got. The reason the SF guys failed the NSI is clear, they are tired of the BS.