The B-2 stealth bomber used to hit the Houthis was built to strike the toughest targets Business InsiderUS stealth bombers hit Houthi underground weapons depots in apparent warning to Iran The Times of IsraelA US airstrike in the Middle East is meant to remind Iran that nothing is out of reach Business InsiderAir Force Uses B-2 Bomber for First Time in Combat Since 2017, Sending Message to Iran Military.comUS attacks Iran-backed Houthi rebels in Yemen with B-2 bombers USA TODAY