Reading this thread made me look back at my admissions essay. It was definitely lengthy at 647 words :sleep_125 . I also conveyed a different attitude than your statement, jonez.
I did not discuss any platform-specific goals such as "flying an F/A-18". My statement discussed that becoming a naval officer was my ULTIMATE goal, and that I liked the opportunities that the Navy can provide me. I didn't suck up to the Academy and write about why the Academy is such an awesome school(I figured everyone on that board already knows most of that info). I even stated in the essay that going to the Naval Academy was NOT ESSENTIAL to becoming a good officer. But I did acknowledge that the Academy provided a unique opportunity, and an extremely challenging and rewarding experience. I also told them why I thought I have what it takes to graduate from there and get a commission.
I just wanted you to check out another person's approach to the personal statement. As for your statement, I wouldn't worry too much about the length(hey, mine was over 600). I think you should talk a little bit more about why YOU have what it takes to put up with all the obstacles that the Academy will present. I'm also not too sure I would start my statement with the operations in Iraq and Afghanistan (that's just me). Personally, I wouldn't want to make it sound like I wouldn't have applied if it wasn't for the current conflicts. And one more thing about your application.....if you want to clarify some of the stuff you bubbled in on your "candidate activities record", you can submit an attachment with it (perhaps describing the club you founded).
But's that just my .0000002 x 10^7 cents. Good luck.