William T. Fitzsimons

Lieutenant William T. Fitzsimons (1889-1917) was a United States Army officer in World War I, and is considered the first American officer killed in the war.

Fitzsimons was killed in a German air raid on September 4, 1917 along with Pvt. Oscar Tugo, Pvt. Rudolph Rubino and Pvt. Leslie Woods, when bombs fell on Base Hospital No. 5 near Dannes-Camiers in Pas-de-Calais, France.

In 1920, Army Hospital 21 in Aurora, Colorado was officially renamed the Fitzsimons Army Hospital in his honor.

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Source: WikiPedia