A THAAD interceptor was launched during a test in July 2017.US Missile Defense AgencyA US air defense system in Israel was just used in combat for the first time since it was deployed.It's unclear if the THAAD battery successfully intercepted the incoming threat.The battery was reportedly used against a Houthi ballistic missile late last week.A top US air defense battery deployed to Israel was recently used in combat in what appears to be the first known instance that the system fired an interceptor since it arrived in the country two months ago.The THAAD (or Terminal High-Altitude Area Defense) battery was used in theater over the past couple of days, a US defense official confirmed to Business Insider on Monday.