Following the US-Israeli assault that killed Supreme Leader Ayatollah Ali Khamenei and other senior Iranian officials on Saturday, Iran has launched retaliatory strikes against Israel and US military assets across the Gulf. The Islamic Revolutionary Guard Corps (IRGC) vowed revenge, initiating what they termed "the heaviest offensive operations in the history of the armed forces." Iran's military strategy has shifted from defensive containment to an explicitly offensive asymmetric posture, focusing on survival through calibrated escalation with missiles, drones, and proxies, a departure from the June 2025 war where direct exchanges were more limited. While Iran has demonstrated a capacity for sustained, albeit intermittent, attacks, its nuclear and missile infrastructure has been damaged, and its economy weakened, leaving the regime vulnerable. The conflict's duration remains uncertain, with Iran capable of prolonged operations but facing economic and political risks, while the US has amassed significant military assets in the region.