From Czechs I would mention:
Jan Žižka z Trocnova, the Hussite war leader who defended Bohemian lands from catholic crusades. His armies used first handheld firearms called “píšťala ” later known as “pistol”, also famous for using “vozová hradba” – wagon wall to completely avoid heavy cavalry of his opponents, this is sometimes mentioned as a first use of tanks in war.
Josef Václav Radecký, Field Marshall – born in Czech, fighting around europe under Austro-Hungarian flag, Johan Strauss composed Radetzky March to celebrate him.
Karel Janoušek, RAF Air Marshall – https://fcafa.com/2012/05/08/karel-janousek/  fighting in Czechoslovakian legions in Russia during WWI and leading exiled Czech pilots in UK during WWII. Swedish band Sabaton wrote him a song https://www.youtube.com/watch?v=LrMyAIuCxGI
For me personally:
Josef Šnejdárek, general
Arnošt Steiner, colonel