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Army and motherhood prepares people for life.
Integrity, honesty, morals, empathy, compassion, civility, honor, sympathy, codes of conduct, and pride are what build. In a world filled with these traits their would be no need for war.
How does flirting prepare us for the future? If you mean sex then yes the outcome could give you an undesireable future (if done too soon or irresponsibly).