When you go up for Chief (or E-8, E-9), what is written in your evals becomes more important than just the marks themselves. Always remember that sustained, superior performance is the single most important factor that influences the selection board for your advancement opportunities. I have always said I’d rather be a 3.8 E-6 going up for Chief with well written comments and valuable input on my accomplishments than a 4.0 E-6 with nothing to back up those marks! The reason is that the selection board will actually look at your evals. And remember they may go back five years! So, this means they may be looking at your E-5 evaluations. And what will they be looking at? They will be looking for the same kinds of things you should have been putting in your brag sheets for your evals!