Not Brumowski, but an excellent guess. Here's your bonus clue.
A name-the-pilot quiz. His name is far from being a household word, but he was very well known in his day.
1. The highest-scoring ace of his service, the highest-scoring ace ever born in what is now a particular country (though it was part of a different country when he was born), and possibly the highest scoring ace in one particular sort of aircraft, though there are no solid statistics about that.
2. After the war, he lived in two countries which had been on the side against which he had fought.