When I was 19, I joined the military's best kept secret, the branch many forget exists. That is, The United Sates Coast Guard.
Yes I was in the military, (and if you didn't know, yes we are a branch of the military, and no, it's not the same as the national guard).
I remember marching around the base and passing by "The Confidence Course". Week by week, day by day we'd pass by the obstacle course. It looked hard. Truthfully, as the more time went by the more terrifying it seemed but so many parts of me couldn't wait to give it a go.