Fulfilling Donald Trump’s campaign promise to “bomb the shit” out of ISIS, the Pentagon dropped the “mother of all bombs” — one of its largest non-nuclear munitions — for the first time on Thursday, in Afghanistan. The 21,600 pound weapon was developed over a decade ago, but was never used due to concerns of possible massive civilian casualties.

The Pentagon said it used the weapon on an ISIS-affiliated group hiding in a tunnel complex in the Nangarhar province. The group, according to the Pentagon, is made up of former members of the Taliban.

The Massive Ordnance Air Blast Bomb (MOAB), nicknamed the “mother of all bombs,” has a mile-long blast radius.

When it first introduced the bomb, the Pentagon said it was designed to terrify America’s enemy into submission. “The goal is to have the capabilities of the coalition so clear and so obvious,” Defense Secretary Donald Rumsfeld said in 2003, “that there is an enormous disincentive for the Iraqi military to fight against the [invading] coalition.”

Thursday’s attack drew condemnation from Hamid Karzai, the U.S.-backed former president of Afghanistan. “This is not the war on terror,” he said, “but the inhuman and most brutal misuse of our country as testing ground for new and dangerous weapons.”

Marc Garlasco, a former senior targeting official in the Bush-era Pentagon, told The Intercept on Thursday that the weapon was never put to use “due to collateral damage concerns.”