An Israeli Apache helicopter fires a missile towards southern Lebanon.Leo Correa/APThe US is sending more troops and an anti-missile system to Israel.The THAAD system will bolster Israel's air defense against incoming threats, the Pentagon said.It comes amid heightened tensions with Iran after Israel's assassination of Hezbollah's leader.The United States is sending troops and an anti-missile defense system to Israel.US President Joe Biden directed Defense Secretary Lloyd Austin to approve "the deployment of a Terminal High-Altitude Area Defense (THAAD) battery and associated crew of U.S.