My understanding is that it was largely a beauracratic term of art within the military until the mid 00s when the military fetishist types picked it up
my personally most disliked GWOT terminology is "military-aged male", because it seems precision engineered to justify shooting unarmed 12 and 70 year olds
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(There's nothing wrong with having a fetish or 5. Knock yourselves out. It's when you make your fetish someone else's burden that we have a problem.)
Hegseth is a creepy little troll who loves war crimes and you should totally kink shame him