The 20 most popular TED Talks of all time

Confidence is one of the leader attributes of presence and it can be taught as it is a habit that is reinforced through life experience. For a cadet being confident or faking it can do little harm, it will also improve your overall bearing and lend to you being a charismatic leader. Just be careful as you move on and remember you don't know what you don't know. A confident incompetent person is dangerous, so be self aware and keep learning. Good luck.

It is such a zero defect Army that people are afraid of making mistakes and can't be themselves.

You can provide someone with all the theory you want, the "do these things and you will be confident." But unless you approach the root cause of their lack of confidence, you're giving them answers to a test they'll never take. Confidence can't be taught, but it can be built. I firmly believe that confidence (true confidence that isn't "faking it") comes from how someone views themselves, it comes from their sense of self worth. You can't change how someone views themselves just by teaching, but you CAN change it by doing. Maybe they need to have the feeling of accomplishment in completing a difficult task. Maybe they need to be shown they have value, and others hold them in high regard.

Fixing confidence is a very personal process, and one size never fits all. But it can be done.