Take no notice of those miserable bar stewards on this forum who lose no opportunity to spread their venom. They are absolutely not typical of the people you will meet in the Services, but they serve their purpose by teaching you whom to ignore and to grow a thick skin.
Well done for putting your question to a military aircrew forum. It shows initiative. Don't be put off by the pooh stirrers. Bin the braces and give it a go. The sky is the limit!
Good luck.