An Israeli offensive in Lebanon could escalate, potentially involving Iran and militants aligned with Iran, especially if Hezbollah is at risk, according to Charles Q. Brown, Jr., the chair of the joint chiefs of staff. The U.S. may struggle to aid Israel in a conflict with Hezbollah, as a full-scale Israeli offensive in Lebanon risks a broader war with strong Iranian involvement to support Hezbollah. Iran is more likely to back Hezbollah if it perceives a significant threat to the group, increasing the danger for U.S. troops in the region.