IDF Chief of General Staff Lt.-Gen. Dan Halutz said Thursday that an offensive in Lebanon would not end until Israel's security was restored, and vowed to destroy Hizbollah's arsenal and military capabilities. "The fighting in the north ... could last much longer," Halutz said in a letter to soldiers and officers. "We are being tested at this time. Our moral strength and value will reflect on the state of Israel and its residents and on their ability to continue to stand up to the threat on the front." "We will operate for as long as necessary until security is returned to the state of Israel," he added.