You mention that Orr lived at a time of war, and that this complicated his life. You might want to elaborate on that earlier in the essay. Also, you don't really talk much about what he did that showed perseverance, apart from training hard, which is presumably true of all professional athletes. Maybe you could talk about his training schedule, injuries he had to recover from, other setbacks he faced, etc. In other words, show his perseverance, rather than just telling about it.
And remember, if at first you don't succeed, don't take up skydiving.
Sean, EssayForum.com