A Safety Fag is a member of the Armed Forces of the United States of America (usually, but not always, the rank of E-7 and above) who is willing to make any trade off in the name of so-called safety. They believe that such things as reflective belts are the most important part of the uniform, even under blackout conditions in a combat zone. They believe themselves to be guardians of lives, when in reality all they do is degrade the morale of those around them.
A Safety Fag Sergeant Major in Afghanistan: "Now some female soldiers are setting themselves up for failure, going out around the FOB at night without a battle buddy and no reflective belt. That's how a sexual assault happens."