"The Zumwalt-class destroyer program started in the early 1990s and has been a problem child ever since. At first, the Navy planned to purchase 32 of the stealth vessels. Then it said it would buy seven. Then three. Now, it may buy just two. After decades and billions of dollars spent, the DoD may instead choose an updated version of the Arleigh-Burke DDG-51 destroyer, a model that entered service in 1991."