Forcing someones idea of "God" and what those beliefs entail onto everyone else is a violation of those very freedoms we claim to hold so dear. Religion should be taught at home and in whatever church you attend and should not be brought into public schools or our government. Much less reproductive issues.
And I don't believe anyone ever joined the military out of fear.
Unless, of course, they were afraid of getting drafted and decided to join a branch they felt would increase their chances of survival.
There are lots of reasons for people to join. In peace time I believe most join for the benefits and/or to see the world (they do a good job selling those things). Or, maybe it was simply the best option at the time.
Those who joined in war time did so because they believed we either needed to defend either our way of life, had a moral responsibility to defend those who couldn't defend themselves, or were fighting against someone/s ideology they couldn't live with.
Everyone else was drafted.