President Donald Trump announced his Golden Dome missile-defense shield for the U.S. on Tuesday. Defense stocks rallied early on Wednesday—none more so than L3Harris Technologies.There should be plenty of additional business for just about everyone.

U.S. President Donald Trump said on Tuesday he had selected a design for the project and named a Space Force general to head the ambitious program aimed at blocking threats from China and Russia.

Midrange “hit to kill” missile interceptors have had many successes on test ranges over the past decade, and Ukraine and Israel have proved their technological capacity to neutralize major missile at...