As I have often said, there is no right granted to anyone to serve in the United States Military. The military can refuse to "hire" you if you are too fat, too skinny, too tall, too short, or even if you have too many kids.
Congress and the courts have held that Title VII of the Civil Rights Act of 1964, which ensures all individuals are treated equally before the law with respect to civilian employment, does not apply to the military profession. No less than seven major Supreme Court decisions support this.
Criminal history (moral) waivers are very much an individual thing, and depends on several individual factors.
Personnel Security Investigations (PSIs) and security clearances are key elements in protecting the security of the United States. What is a security clearance? What do they look at? What can keep me from getting a security clearance? How far back to they investigate? How long is a security clearance valid? This article answers those questions, and more.
Many military members have the choice to live on-base or off-base. So, which is better? There is no clear answer. It depends on your branch of service, the base you're assigned to, the policies of your base/command, whether you are married or single, and whether you are a junior member or have a few years of service under your belt.