Iran sees Israel as its arch-nemesis. The Jewish state fought a 2006 war against Iran's ally, the Lebanese militant group Hezbollah. Israel and the US have not ruled out a military option against Iranian nuclear facilities.
Gen Gholam Reza Jalali, who heads a unit in charge of civil defence, said Iran sent a team to Lebanon to study strikes during the 2006 war and changed its defence plans accordingly.
Jalali said Iranian military officials learned after analysing the package that tall buildings collapsed not because of a bomb's power, but the engineering technique used to bring it down.
Iran has employed what it calls "passive defence," measures to minimise the effects of damage caused by attacks.
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It has built underground nuclear facilities, such as the Fordo uranium enrichment site, which it says is buried under 90 metres of rock for maximum protection from aerial attack.
"It took three years to develop the new doctrine to confront the US," he said. He says the new doctrine made Iran spread out its installations and combat forces to minimise damage in a possible war.
"We changed the deployment of military forces from a mass concentration to managed format," he said.