[2] Tyndall served as a major in command of a battalion of the Indiana Field Artillery, which was at service on the Mexican border when the United States declared war on Germany in 1917.

Tyndall was promoted to colonel in command of the entire regiment, which was issued French 155 millimeter cannons.

The men referred to him simply as "Bob," and generally admired him as an officer who had started as a private and worked his way up through the ranks.

[6] Colonel Tyndall was awarded the Distinguished Service Medal, the Croix de Guerre, and Légion d'honneur.

[10][11] The armory was the headquarters for the 76th Infantry Brigade Combat Team from 1969 until 2011, when the unit moved to a new facility at the former Fort Benjamin Harrison.