The report concluded that the Pentagon was in compliance with the requirements of the Geneva Conventions. The review included some of the most contentious issues, including the forced feeding of hunger-striking detainees and claims that many prisoners were suffering from psychosis as a result of conditions in the detention center.

According to one official, the report noted that some detainees had difficulty communicating from cell to cell, a contention that many detainees’ lawyers have also made. The Pentagon has long insisted that no detainees are held in solitary confinement. Military officials have said instead that the prisoners are held in “single-occupancy cells.”

Some Pentagon officials have continued to press the case that the Bush administration’s approach to detainee issues  and the Guantánamo Bay prison itself  should not be abandoned. The report is likely to accelerate that behind-the-scenes struggle.

The White House had no comment Friday.

One Pentagon official, speaking on the condition of anonymity because of the sensitivities involved in challenging the White House plan to close the prison, argued that the report showed that the Bush administration had created a humane detention camp. Speaking of the remaining detainees, this official said the report showed that if the men were moved, they might “go from a humane environment to a less humane environment.”

Critics of the Guantánamo Bay detention center, which is on the grounds of the American naval base at the eastern end of Cuba, have been preparing for Admiral Walsh’s report. They said they were concerned that the new administration would use it to avoid major alterations to the Guantánamo detention camp during its final year.

Gitanjali Gutierrez, a lawyer for Guantánamo detainees at the Center for Constitutional Rights, said that she and other lawyers found that conditions have remained bleak since the start of the new administration.

Ms. Gutierrez said that a report by the rights center, to be released next week, asserts that two major Guantánamo prison buildings, known as Camp 5 and Camp 6, should be closed immediately. She said prisoners there continue to be held in isolation for as long as 24 hours a day, that psychological difficulties are treated as disciplinary infractions, and that many cells are windowless.