Google "Hacking the College Essay 2017" it says to "write the essay only you could write."
I see 1/3 is about olympus, 1/3 is about your grandfather, and 1/3 is about you. It needs to be more about you.
And for you , it seems like you are saying that you want to go because he went.
You want to live a life of service...but why the military? Why the Naval Academy given that you are in NROTC?