[I]t can be difficult for younger people to remember that [World War II] was a war fought not by the elderly in black and white, but by millions in vivid color.

Originally shot by the [United States] War Department, [t]hese photos document the trucks, planes, trains, and other various machines that were being prepared on the home front in anticipation of the conflagration sweeping the globe.

Shorpy via Jalopnik.