Navistar International Corp. engages in the manufacture of military truck, proprietary diesel engines, school and commercial buses, and service parts for trucks and diesel engines. It also offers retail, wholesale, and lease financing services for trucks and parts. It operates through the following segments: Truck, Parts, Global Operations, and Financial Services. The Truck segment manufactures and distributes Class 4 through 8 trucks, buses, and military vehicles under the International and IC brands, along with production of proprietary engines, primarily in the North America markets that include the US, Canada, and Mexico. The Parts segment provides customers with proprietary products together with a wide selection of other standard truck, trailer, and engine service parts. The Global Operations segment consists of the operations of its wholly-owned subsidiary, IIAA, which manufactures and distributes mid-range diesel engines and provides customers with additional engine offerings i