Yeah, if you abuse steroids your body produces alot less test. So when you stop taking gear to pass a drug test you numbers look crazy low. Sometimes so low you can get a doctors note for them to give you replacement. For the army that would mean free steroids on the government dime. And or the kinda CTE you get from repeatedly being too close to explosions does seem to cause damage to your body's ability to regulate hormones. Not as sure about that last one