[FreedomCalls]

Young males are easily manipulated during the period of their lives when they exist outside the female domain, after the mother and before the wife.

One third of the military are females now. Why do they join?

[sarasmom]

Because we can.
Not everyone joins the military for the educational opportunities, the travel, the challenge, or because we are just natural born serial killers who failed the stringent entry requirements of the local crime gangs.
Why does anyone pursue any particular career?
Frankly, the entry qualifications for the USA DOD are more exacting and dismissive of those deemed most likely to fail, than the requirements of higher educational institutions.
Of course, the goals are also different.
Is there a high probability that the candidate can perform the required tasks, at least minimally competently?
versus
Will they pay the tuition fees?