The Lipetsk fighter-pilot school (German: Kampffliegerschule Lipezk, also known as WIWUPAL from its disguise German name, Wissenschaftliche Versuchs- und Personalausbildungsstation, Scientific Experimental and Personal Training Station) was a secret training school for fighter pilots operated by the German Reichswehr at Lipetsk, Soviet Union, because Germany was prohibited by the Treaty of Versailles from operating an air force, and sought alternative means to continue training and development for the future Luftwaffe. Today it is the site of Lipetsk Air Base.