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Mr. Obama halted all military commissions now under way at Guantanamo on Jan. 22, just two days after he took office, and pledged to close the detention facility within a year. In May, though, he announced he would revive the Guantanamo military tribunals first set up in 2006 by President Bush with new rules. He has not yet done so, even though prosecutors are prepared to move to trail with at least 66 cases.

Although the president is trying to transfer some of the 229 detainees to other countries, lawmakers on Capitol Hill voted last month to ban the detainees from being released in the United States through Sept. 30. Family members of the victims say the Cuban facility should remain open to try the detainees in military commissions.

“To Mr. Obama, senators and representatives: Please keep Guantanamo Bay open and the commission hearings continuing,” said Mrs. Reiss.

The victims’ family members, also in the soundproof room, groaned when a defense attorney said he did not want “the guard force to continue to harass” his client to appear in court.

After the session, Mr. Habermann charged that Mr. Obama is seeking to close the camp because “it became a campaign promise.”

Brian Long of Leesburg, Va., choked up when he said, “The truth about what’s going on here is not being told. ”

“The world and the United States have a right to know what’s going on here,” he said as he defended the facility. “The only injustice is being orchestrated by our leader, making decisions about things he knows nothing about.”

Mr. Long lost his parent in the plane that crashed into the Pentagon.