What analogy does pyle use to communicate the idea that the most people at home have a incomplete comprehension of what war is like?

Pyle explains that people at home watching war reports is like watching a trailer for a movie. They have only seen pieces, but think that they know "everything" that is happening. The only people to truly understand and "see" the entire movie of war are those involved. Only the soldiers truly understand all the aspects of war. Civilians can attempt to empathize and understand where they are coming from, but they will never truly understand because they were not there. They didn't live it.