Israel’s Arrow recently made its combat debut with the interception of a Syrian anti-aircraft missile. Remarkably, the 1991 vintage Arrow missile defense system managed to track, engage, and destroy a type of target never envisaged during its design. This sent a powerful message that Israel's missile shield is reaching maturity. The political repercussions of the interception raised questions about its advisability, but the repercussions of a non-interception might have been even more severe.