What was learned:
* Weeks of heavy bombing of military targets and supply-lines before the start of a ground offensive can seriously cripple an enemy force, but it can't win the war alone. A ground attack is necessary to bring about total victory.
* The controversial Apache attack helicopter, once disparaged as likely to encounter too many technological problems, works well in desert conditions.
* Early U.S. strikes on Iraqi air defense systems prevented enemy commanders from challenging allied air attacks.
* Stealth technology works. The F-117 fighter flew thousands of missions over Iraq's most heavily defended sites and was never scratched by enemy fire. In fact, Air Force officials say, it was never even seen.