Why do some military personnel feel disconnected from their peers, and how does this affect their decision to stay or leave?

My life feels like an endless war, and I don't think I can keep fighting anymore. What should I do?
What are some simple exercises I can do in a week to feel better about going to the beach without overexerting myself?
Why is it considered unreasonable to expect first-world election systems to produce clear results quickly, securely, and transparently?