Retreat

From OMGWiki

A withdrawal is a type of military operation, generally meaning retreating forces back while maintaining contact with the enemy. A withdrawal may be undertaken as part of a general retreat, to consolidate forces, to occupy ground that is more easily defended, or to lead the enemy into an ambush. It is considered a relatively risky operation, requiring discipline to keep from turning into a disorganized rout.

In Company of Heroes your units can retreat to your headquarters. In Operation Market Garden they retreat off the map and out of the battle. You can do this with any unit type, and the primary benefit of this is to preserve that unit's veterancy.