The U.S. military has significantly increased its presence in the Middle East, preparing for potential escalations in violence. What Happened: Following the assassination of Hassan Nasrallah, leader of Hezbollah, in Beirut by Israeli forces, the region has seen heightened tensions. This incident has raised concerns about a possible all-out war involving the U.S. and Iran, Business Insider reported on Tuesday. President Joe Biden has directed Secretary of Defense Lloyd Austin to enhance the defense posture of U.S. forces in the region. The Pentagon has confirmed the deployment of additional for…