OSK

Oshkosh Corporation

A maker of purpose-built vehicles for firefighting, construction, aviation, waste collection, and defense, Oshkosh builds well-known brands like Pierce fire apparatus, JLG aerial work platforms, McNeilus refuse trucks, and the USPS's electric delivery trucks. Founded in 1917 as the Wisconsin Duplex Auto Company and named after its Wisconsin hometown, the firm's first four-wheel-drive prototype, nicknamed "Old Betsy," is still kept on hand and rolled out for parades today.