fighter-pilot school Lipetsk
... that Germany, prohibited by the Treaty of Versailles from having an air force, operated the secret fighter-pilot school Lipetsk in the Soviet Union from 1926 to 1933?
... that Germany, prohibited by the <a href="./Treaty_of_Versailles" id="mwDew" rel="mw:WikiLink" title="Treaty of Versailles">Treaty of Versailles</a> from having an air force, operated the secret <b id="mwDe0"><a class="mw-redirect" href="./Fighter-pilot_school_Lipetsk" id="mwDe4" rel="mw:WikiLink" title="Fighter-pilot school Lipetsk">fighter-pilot school Lipetsk</a></b> in the <a href="./Soviet_Union" id="mwDe8" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> from 1926 to 1933?