I have found there are four steps to change. 1. You must want it. 2. You must believe it. 3. You must live it. 4. You will become it.
I am going to take something I learned over in Israel. Their Independence Day...
You do have to change things as warfare changes.
My philosophy is that not only are you responsible for your life but doing the best at this moment puts you I the best place for the next moment.