"Mex" is the abbreviation to be used for the Mexican expedition. Further the instructions state: "Persons are not veterans of an expedition, however, unless they actually took part in the expedition. For example, veterans of the Mexican expedition must have been in Mexico or Mexican waters at the time of the expedition..."
Henry L. Hixenbaugh was not the only person on the page with that notation which might imply that a local unit was sent to the border. A website of the Iowa National Guard has more information and a link to a digital copy of an old publication that contains photos and names of the men in each unit of the guard involved in the Mexican Border Service 1916-1917. The Iowa guard was called up in late June 1916, trained about a month at Fort Dodge in Des Moines, then were transported by train to Brownsville, Texas. Guard units were entrusted with securing the Mexican border while regular troops pursued Villa. In December 1916 and January 1917 the Iowa Battalion consisting of three regiments of infantry and other troops returned home.
Henry served as a cook in Company M, 3rd Infantry, a unit from Red Oak as might be expected. He must have had many interesting stories to tell of his time on the border. Council Bluffs newspaper accounts at Ancestry.com show a Henry Hixenbaugh of Red Oak as interested in fostering a baseball program and politics serving as a councilman during the 1940s and 50s. Probably he was Lizzie's husband.
|Iowa Troops in Mexican Border Service, 1916-1917, photographed, compiled and published by Dick Dreyer, Iowa City, Iowa|