Bethesda’s Clark/Balfour Beatty has won a $641.1 million design and construction contract, the first awarded in the upcoming military reorganization that will transfer some medical services from Walter Reed Army Medical Center to Bethesda’s National Naval Medical Center.

While preliminary design work and permitting efforts included in the contract can begin immediately, no construction or groundbreaking is expected until summer because officials are still going over environmental planning concerns.

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