Mr Hagel made the comments at a joint news conference with British Defence Secretary Philip Hammond.
At a joint news conference after two hours of talks, both joked about the error.
"We've passed through an era of profound irresponsibility, " Obama said at a joint news conference.
Mr Bush was speaking at a joint news conference with the Ghanaian president, John Kufuor.
BBC: Mr Bush said the US did not want to add new bases in Africa
At a joint news conference, France's Socialist president addressed his political differences with Germany's conservative leader.
"The Doha caravan seems to be lost in the sand, " he told a joint news conference.
The two men said during a joint news conference that expected a deal to be reached soon.
Following the meeting, they will hold a joint news conference in the East Room at approximately 11:35 a.m.
At a brief joint news conference with the prime minister of Australia, President Bush was asked today about China.
They were to hold a joint news conference before having a working dinner.
It will be followed Friday by two rounds of meetings followed by a joint news conference and a private dinner.
They plan to hold a joint news conference in Merida on Wednesday after meeting with Mexican lawmakers in the morning.
Following Mr. Karzai's speech, Mr. Hagel also canceled a planned joint news conference with the Afghan leader at the presidential palace.
"We intend to investigate thoroughly exactly what happened, " Obama told reporters Wednesday during a joint news conference in Jerusalem with Netanyahu.
Iraq's deputy parliament speaker and a spokesman for al-Sadr's movement praised the agreement Monday during a joint news conference in Baghdad.
Okada made the rare apology during a joint news conference with South Korean Foreign Minister Yu Myung-hwan, Korean state-run media reported.
President Bush also responded to detractors during a joint news conference Thursday with South Korean President Roh Moo-hyun in Gyeongju, South Korea.
"There's a cost obviously in the United States as well, " Obama said during a joint news conference with Costa Rican President Laura Chinchilla.
Following is a White House transcript of today's joint news conference of President Bush and Iraqi Prime Minister Nouri al-Maliki in Amman, Jordan.
"Any militarization of the Syrian issue will be disastrous, " Annan said at a joint news conference with Iranian Foreign Minister Ali Akbar Salehi.
Kennedy spoke in 1962 at the National Palace, which also was the setting for a joint news conference Thursday with Obama and Pena Nieto.
Morsy on Wednesday was in Berlin, where he referred to the strife in his country during a joint news conference with German Chancellor Angela Merkel.
"We're laying the foundation for a more effective international legal framework, to shut down exploitative online enterprises, " he told a joint news conference in Brussels.
"Germany and Italy are interested in binding Turkey closer to the West and Europe, " Mr Schroeder told a joint news conference with Italian Prime Minister Silvio Berlusconi.
Obama pushed at a joint news conference for continued diplomatic efforts, including negotiations and sanctions, intended to get Iran to comply with international safeguards against nuclear arms.
CNN: Obama, Netanyahu agree on preventing nuclear-armed Iran
Boeing's head of commercial airplanes Ray Conner said at a joint news conference with Ryanair on Tuesday that the problems with the 787s had not affected orders.
"This is very painstaking work ... it is labor-intensive work but it is necessary work, " Rice said at a joint news conference with Palestinian President Mahmoud Abbas.
Notably, Israel's new defense minister, Moshe Yaalon, said at a joint news conference with Hagel on Monday that he, too, thinks non-military means ought to be pursued further.
"Convincing North Korea to give up their nuclear program, it is not a simple matter, " according to Lee, who said there's no deadline, at the joint news conference with Obama.
"I've always had it in my mind that this was the time to announce new arrangements, " she told a joint news conference with the departing ministers in the capital, Canberra.
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