Zeppelin. The Americans used them mostly forreconnaissance and minesweeping. Zeppelin is actually the word that the Germans used for an airship, but it is the only word related to WWII that starts with z.
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Zhukov was a General in the Red Army in World War 2. That was the only Z word I could think of for you.
The Franco-Prussian War was not directly related to the entry of the US into World War I.
Go to the related link(WW 1 war planes) for a comprehensive list of WW 1 war planes
Please have a look at the related question.
the remember belgium poster
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