PARIS— Lockheed Martin in 2018 won some $31 million in grants from the British government to establish a vertical-launch spaceport in Sutherland, Scotland. Since then, it has declined to name the vehicle it plans to use there.

The market’s presumption was that it would be Rocket Lab’s Electron, a U.S.-designed vehicle that operates from New Zealand. Lockheed Martin is a major investor in Rocket Lab.

Lockheed Martin officials had said in 2018 they expected to reach agreement with Rocket Lab . . .

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