General Motors is adding missile parts to its manufacturing résumé.

On Thursday, major defense contractor Lockheed Martin announced that GM Defense — the automaker’s military subsidiary — had delivered housing components for the PAC-3 Missile Segment Enhancement interceptor, a missile used by the Patriot air-defense system. The companies entered into a formal contract on August 6, and the first batch of components was delivered to Lockheed 22 days later, the companies said.

Tim Cahill, Lockheed Martin’s president of missiles and fire control, called it an “extraordinary 22‑day turnaround.”

Demand for Patriot interceptors, particularly the…