Israel and the United States delivered a powerful strike against the Yemeni Houthis.
Two interesting points!
1 Before that, the Houthis launched a ballistic missile strike on Israel (Jaffa). They fired one missile (a modernized version of the old Soviet "Scud"). Just one!
Israel has a three-tier air defense system. Several launches were made, but they were unsuccessful.
2. During the Houthi attack, an American ship shot down... its own aircraft. Both pilots ejected safely. The pilots were rescued.
So!
No air defense system provides a 100% guarantee of protection!
"Friendly fire" can occur in any army around the world.