Bath Iron Works' contract for the first two destroyers, is $1.8 billion, Johnson said. It will get an additional $212 million for the steel work on the third.
"HII was only under contract for the two composite deckhouses, two composite hangars, and two sets of steel aft missile-launching cells," he said. Johnson said Huntington Ingalls' estimate for those two assemblies totaled $767 million, Johnson said.
Johnson could not comment on the Navy's future use of the Gulfport plant.
"It's difficult to say. I'd hate to make a statement that would say either way," he said. "Any time we design a new ship class we're going to look at all the potential, all the options."
In October, Huntington Ingalls announced delivery of the composite deckhouse for the destroyer Zumwalt, the first in its class.
"This is a significant delivery in the history of Ingalls Shipbuilding," program manager Steve Sloan said in a 2012 press release. "Building composite ship structures takes a very unique skill-set and work ethic, and the men and women in Gulfport have done an outstanding job. This is one of the largest carbon composite structures ever built, and we are delivering a fine product with the utmost quality."