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The final cost of the Zumwalt is expected to be at least $4.4 billion.The original concept for the land-attack destroyer was floated more than 15 years ago then underwent several permutations. The final design called for a destroyer with a stealthy shape and advanced gun system that can fire rocket-propelled projectiles with pinpoint accuracy.But the growing cost forced the Navy to reduce what was originally envisioned as a 32-ship program to just three ships. The loss of economies of scale drove up the cost of the individual ships.