A 2011 post by Ben Horowitz, linked to recently by Steven Sinofsky.

In peacetime, leaders must maximize and broaden the current opportunity. As a result, peacetime leaders employ techniques to encourage broad-based creativity and contribution across a diverse set of possible objectives. In wartime, by contrast, the company typically has a single bullet in the chamber and must, at all costs, hit the target. The company’s survival in wartime depends upon strict adherence and alignment to the mission.