According to the AP:
The 4th U.S. Circuit Court of Appeals in Richmond, Va., issued the brief order Thursday that upheld the injunction by U.S. District Court Judge Terrence Boyle.
. . .
The Navy wanted the appeals court to overturn Boyle and allow it to continue buying land from willing sellers and doing other work while the lawsuit brought by counties and environmentalists continues.
The Navy wants the 33,000 acres near the Pocosin Lakes National Wildlife Refuge because there are few artificial lights on the rural landscape, simulating the nighttime darkness around an aircraft carrier at sea.
The opinion is not yet up on the court's web site. When it is, I will post.