Please write a paraphrase for the following text.
He was also remarkably free of personal ambition for someone who'd risen to his rank in the People's Navy, even under the conditions of accelerated promotion which had obtained after the purges of the old officer corps.
For a man who'd gained his position in the People's Navy, although that had happened under the circumstances of accelerated promotion at a cleansing position in the old officer's corps, a personal ambition was not unremarkably lacking.