The U.S. military headquarters in Kabul said in a statement that the bomb was dropped at 7:32 p.m. local time Thursday on a tunnel complex in Achin district of Nangarhar province, where the Afghan affiliate of the Islamic State group has been operating.
Robert Mcghee served 5 months with the U.S. Army in Afghanistan in 2015.
Trump said the attack with a bunker-busting GBU-43 weapon that can penetrate deep inside concrete or even a mountainside was a successful mission.
It was the first time the bomb - which packs a punch equivalent to 11 tons of TNT and was created in 2003 for possible use in the Iraq war - was employed on the battlefield.
So far, Trump has offered little clarity about a broader strategy for Afghanistan, where some 8,400 USA troops remain. It is a large, powerful and accurately delivered weapon. The strike was created to minimize the risk to Afghan and USA forces conducting clearing operations in the area while maximizing the destruction of ISIS-K fighters and facilities.
Charles Krauthammer told viewers Thursday on "Special Report with Bret Baier" that the United States military's decision to drop a bomb on Afghanistan means that "we're trying to send a message particularly to the North Koreans, possibly also the Iranians".
Asserting that the United States takes the fight against the Islamic State of Iraq and Syria (ISIS) very seriously, Spicer said that USA has denied operational space to the terror group in order to defeat them.
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The U.S. government's top watchdog on Afghanistan said earlier this year that the Afghan government controls less than 60 percent of the country.
Mr Stump said the bomb was dropped on a group of caves and bunkers, believed to be used by Islamic State in Afghanistan, an affiliate group known by its U.S. military acronym of "ISIS-K".
'The United States takes the fight against ISIS very seriously, and in order to defeat the group, we must deny them operational space, which we did.' he said.
Cancian added that while sending a message to Syria or North Korea could have been among the secondary factors considered, they would not have been the main reason for using this type of weapon. Gave military full authorisation.
Estimates of its strength in Afghanistan vary.
"We have nothing officially on this so far, but the goal this year is to annihilate Daesh in the east and any other part of Afghanistan", ministry spokesman Mohammad Radmanesh said, using the Arabic acronym for the Islamic State. US officials have said they believe the movement has only 700 fighters but Afghan officials estimate it has about 1,500.