REI halts orders from Vista Outdoor over its response to Parkland shooting

No military exemptions, but I have never heard of a sworn police officer, other LEO, or Federal Agent younger than 21. On the other hand, I have known many excellent soldiers between the ages of 17 & 21.

CPT (Join to see) - He was the youngest of my LEO nephews, and a local officer, not a FED. His two older brothers were 21 before they were sworn, and both went on to become career Port Authority of New York officers.
There were, and still may be, some troops who are combat veterans at 19.

I was held at port of embarkation on orders the VN and flew out of California on my 18th Birthday.

CW3 Harvey K. - I had more than a few 18 y/o soldiers that became combat veterans under my command in Iraq and Afghanistan. They were all exceptional shots under pressure and I had to hen over them to a certain extent to to make sure they used appropriate cover, concealment, and terrain features. I discovered that combat video games and excellent marksmanship instruction more or less made them what they were. Primarily due to the games, they viewed aggressors as "targets" (as in the game) whom they systematically and with relentless military efficiency engaged and destroyed without a second thought. The problem I found with them is they subconsciously believed that if they were shot there would be a place where they could "restore health". It wasn't until one of their peers was KIA that they understood what I had been harping on during the hot wash.