Truths so brutal, and predictions so harsh that no one dares write them down.
But now we enter the information age, and certain realities are essentially undeniable, and can no longer concealed from the civilian panopticons like Google.
Sort of like how TV Networks (and even basic cable channels to a degree), with their Standards & Practices departments, waste time sanitizing television destined for the public air waves and radio spectrum, while media on the internet operates with an almost total lack of restraint.
Basically, get a degree in a related field (international politics, security, languages, demographics, economics, etc), and have decent marks. Apply. Don't tell anyone (until they have briefed you on what you can say). Don't have any skeletons in your closet.
It's basically like getting a USAID job, but probably not as competitive (lots of funding = lots of positions, and most people doing these kinds of degrees tend to not be very pro-defence) and with slightly higher security requirements.