I'm not defending this or anything, but just thought I could add some context to why they're separate organizations...

If you Google the history of the Boy Scouts, even as far back as to the original scouting groups in the UK that eventually made their way to America, much of the skills that were intended to be the focus of youth education came from observations and experience made in wartime.

That skill set was essentially the basis of the The Boy Scouts of America's initial objectives. I don't believe the original founders of the BSA intended for the boys to have quasi-military training but WWI came out of nowhere and the uniformed, patriotic, troop brothers, would run security for the POTUS here or there, or help monitor radio communications, etc., and I think around that same time, the BSA took on a more militaristic preparatory role. The graduation rates from schools like West Point tend to suggest that scouting may have helped direct a boy to a military career. I know that gentlemen who have earned their Eagle can enlist in the military at a higher rank than a person who has no Eagle. The two organizations have always been somewhat hand-in-hand.

Here is an article from February 2015 about a study being conducted by the military to determine whether the government should allow certain sex-based exemptions in armed forces career paths. Remember -- women couldn't openly fill a combat role until just a couple of years ago... and since the armed services useful skills circle back in the handbooks and training guides for young Cub Scouts, it's just been kept boys.

Add in a dash of religion and "the man's duty is to protect the women," and that's why they're still separated. Perhaps someday, when men and women are equally represented among various career paths, military, government, private sector, whatever, someone will come up with an idea to form an all encompassing youth organization that teaches girls how to tie 80 jillion styles of knots, boys to ride horseback and how to quickly sew up that tiny tear in your jeans with a piece of thread, with some added gun safety training, wilderness training, water safety skills, helping the community, even if you may have personal religious objection to a single member of that community, striving to be your best, and loving your country thrown in. The problem is that even in 2015, the politicians would rather have the conflict that keeps them employed. Can you imagine troop movie nights with cookies and popcorn for all? Sigh...