This website provides a brief description of the 5 branches of the US Military. It gives an overview of general eligibility,training and advancement within the system. It also answers top questions and has a job finder.
http://www.careeronestop.org/jobsearch/findjobs/military-options.aspx
This website gives a more detailed look at the military branches today. It discusses entrance requirements, benefits and career opportunities.
Practice tests: