ELGIN, Okla. (AP) — BAE Systems has broken ground on an expansion to its facility in Elgin that will provide final assembly of the Paladin Integrated Management program for the U.S. Army.

The PIM artillery is an upgrade to the Paladin Self-Propelled Howitzer. It includes a new chassis, engine, transmission, suspension and steering system. It's cannon remains the same as the current Paladin.

Initial vehicle production will take place in York, Pa., before coming to Elgin for final assembly and testing at nearby Ft. Sill.

Work on the PIM program is expected to begin during summer 2014 with the first vehicles arriving in Elgin late in the year. The first vehicles will be delivered to the Army in 2015.