The campaign to cripple Iran’s military had been underway for one day when U.S. forces experienced their single deadliest episode. An explosive-laden one-way attack drone slipped through the defensive layers surrounding a tactical operations center at the Port of Shuaiba in Kuwait.

Six U.S. Army Reserve soldiers, assigned to the 103rd Expeditionary Sustainment Command, were killed when that Iranian drone struck their position on March 1. Several others were injured.