In the history of warfare and of pilots, World War II is deemed the last war where large numbers of pilots from different nationalities could be found in large numbers.
Some famous pilots worth mentioning are:
Erich Hartmann, a German fighter pilot who still holds the title of highest scoring fighter pilot, with 352 confirmed kills.
Hans Ulrich Rudel, the most decorated German serviceman in the entire war, being Stuka dive-bomber pilot with over 2000 combat missions to his credit, as well as being an ace with nine kills in a Stuka.
Hans-Joachim Marseille, the highest scoring ace on the WEstern Front of the European Theater, with 158 kills to his credit.
Richard Ira "Dick" Bong is the highest scoring American ace of all time, with 40 kills to his credit, all made in the Pacific Theater in a P-38 Lightning.
Gregory "Pappy" Boyington was a Marine Core ace in the Pacific Theater, serving in the American Volunteer Group and forming the