All the choppers.
Command & Conquer: Generals - Zero Hour is the expansion for Command & Conquer: Generals and picks up where the main game ended: The GLA is in control of Baikonur, threatening the world with weapons of mass destruction. It's up to us to stop them.
Zero Hour contains three new campaigns of five missions each, one for each side, with their chronological order being USA first, GLA second, and China last.
Unlike the previous campaigns, which were noted by Command & Conquer fans for not having full motion video cinematic sequences during mission briefing, the Zero Hour campaigns return to that Command & Conquer tradition, each showing a live-action video of a news reporter of the respective side giving details about the situation behind the current mission.