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Iran is preparing to unveil a new weapon dubbed the “father of all bombs,” a spokesman for the Islamic Revolutionary Guard Corps (IRGC) said on October 21, as Tehran signals a shift toward a more offensive military doctrine.
“We are in the stage of preparing to unveil the ‘father of all bombs.’ This is something new for the enemy,” IRGC spokesman Hossein Mohebi said in remarks carried by Iran’s Young Journalists Club news agency.
His remarks came after United States President Donald Trump hinted last week at the possible use of the GBU-43/B Massive Ordnance Air Blast bomb, known as the “mother of all bombs,” against Iranian nuclear facilities.
Weighing approximately 9,800 kilograms, the GBU-43/B is among the largest non-nuclear conventional bombs in the U.S. arsenal. It was first used in April 2017 during Trump’s first presidential term, when U.S. forces targeted a tunnel complex belonging to the Islamic State group in Afghanistan.
Mohebi also said Iran’s missile stockpile had increased 1.5-fold following the 12-day war between Iran and Israel in June 2025, without disclosing specific figures.
“The quality of the missiles has improved significantly, and their range, destructive power and accuracy in hitting targets have increased,” he added.
The IRGC spokesman said Tehran was moving away from a predominantly defensive military posture toward what he described as permanent and absolute deterrence.
“Previously, Iran’s defense doctrine was purely defensive. We used to say that if a country attacked us, we would respond,” Mohebi said.
“Now, we say that if a country attacks us, we will not only respond but also launch an offensive,” he added.
In addition, the spokesman affirmed that Iran would retaliate against any attack with comparable measures and increasingly rely on asymmetric warfare to impose greater costs on its adversaries.
“Our doctrine will no longer be merely offensive; it will be asymmetric. We will attack the enemy in a way that makes them feel the intensity of our response,” he said.
The remarks came amid reports of expanded Iranian missile exercises. Israeli newspaper Israel Hayom reported on October 15, citing Arab media, that Iran had launched at least 30 ballistic missiles of two types during an IRGC exercise earlier in that week.
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