As a hetero, I would fear homo’s in contact with me, for health risk reasons. I can put myself at risk for PC purposes, but can not afford to risk family.
Just as I don’t do high risk sport activities for sake of family, I (and many others) would not want to be in situations of unnecessary risk, which would include being in the military, combat arms especially, where contamination risk by an infected homo is high.
Dittos for someone with any communicatable disease.
Safe beats PC (sorry).
I don't know what Duncan Hunter could be thinking of here.