I have no argument with anything you have said.
I make my own judgement on the my little pony crowd. More and more I am seeing young men have a difficult time becoming men, leaving behind the things of their youth and getting on with life.
As many far wiser than I have observed, one of the most childish things is the fear of being seen as childish.
Every television show, movie, and book has a fandom. In today's world there are "geeks" who get into these media--sometimes far too much. "Friendship is Magic" is as good a show as any (and better than most) for people to "geek out" about. Because it is aimed at children and their parents, it is a decent show, with no controversial or political content (so far, at least, and I hope this remains the case). But it is intelligent and well-written enough for adults to enjoy and a lot of fun, and if people in the military enjoy it, I don't see why you would begrudge them. I can also see why some of the characters would be seen as military mascots.
I don't doubt that what you say about our current youth is true, but this cartoon show is not part of that. I do not ask you or anyone to watch the show but merely hope you will accept it for what it is--a very good cartoon show that both children and adults can enjoy. Your anger at the homosexualization, metrosexualization, or infantilizing of the military is being aimed at the wrong target here. Those military bronies whom you consider a symptom of society going to hell in a handbasket are defending all of us and I don't our rank-and-file military personnel would be so fond of a show that was attacking what they stand for. The subversion of our military comes from the top. I don't think you can accuse the PC pols who run our military of promoting this show among the troops.
One final suggestion, and that's all that it is: every single episode of the show is on YouTube. If you want to see what all the fuss is about, you are free to view any episodes you might wish to. I'm not asking you to try the show out for yourself. But before you attack our young men in uniform for liking a TV show you might have the courtesy to see what it is they are enjoying before you brand it "subversive." If you choose not to do this, then perhaps you should consider the possibility that you don't have the information to stand in judgment on this show or its military fans.
“...do in their off hours but they need to wear appropriate civilian clothing.”
In college I took some classes put on through ROTC. Got a uniform and everything as a freshman.
Thought the shirt looked cool with jeans and was walking to class one day. One of the real ROTC guys informed me that I was not to do that, and that I was to turn around and go change. I was about to point out that then I would be late to my next class, but realized better. “Yes sir. Right away sir.”