The U.S. military said it concluded “proportional” retaliatory strikes against Iran on Tuesday, one day after Iranian forces shot down an Army helicopter near the Strait of Hormuz.

“U.S. Central Command (CENTCOM) forces completed self-defense strikes against Iran, June 9, at the Commander in Chief’s direction in response to yesterday’s downing of a U.S. Army Apache helicopter,” U.S. Central Command wrote.