parachute training tower
... that the British Empire's first parachute training tower was built by the Polish military?
... that the British Empire's first <b id="mwAQ0"><a href="./Parachute_tower" id="mwAQ4" rel="mw:WikiLink" title="Parachute tower">parachute training tower</a></b> <i id="mwAQ8">(example pictured)</i> was built by the Polish military?