The detainee "caught the iguana by the tail at which time the tail detached," the May 2005 report described. When the guard turned to talk to a commanding officer, "he felt something strike him in the lower right back" and then "saw the tail on the ground at his feet and blood was in the same area of his uniform." The detainee said he was "just playing."

Nicolucci said one of the most serious incidents occurred this May, too recent to be recorded in the Pentagon's released reports. A prisoner staged an apparent suicide attempt while his inmates slicked the floors with human waste, seeking to overpower guards when they slipped, he said.

"We provide fans in order to keep them cool," Nicolucci recalled. "And they were using the basket, or the grate of the fan as a shield, the blades as machetes, the pole as a battering ram."

That disturbance was turned back in a few minutes with some guards and prisoners sustaining minor injuries, he said.

The Landmark Legal Foundation, a conservative legal group that fought to force the Pentagon to release the reports under the Freedom of Information Act, said it hopes the information brings balance to the Guantanamo debate.

"Lawyers for the detainees have done a great job painting their clients as innocent victims of U.S. abuse when the fact is that these detainees, as a group, are barbaric and extremely dangerous," Landmark President Mark Levin said. "They are using their terrorist training on the battlefield to abuse our guards and manipulate our Congress and our court system."

Though all detainees are foreigners, many are clearly Americanized when it comes to their insults and gestures. Male guards are frequently derided as "donkeys" while female guards are routinely called "bitches" or harassed by references to their breasts or genitalia, the reports said.

In all, nearly a quarter of incidents involved female guards, the reports show.

"They absolutely target female guards," Nicolucci said. "They have a lot of cultural biases about females, and we let them know in our culture that females do everything males do in a professional job environment, and we just hold firm."

James A. Gondles Jr., executive director of the American Correctional Association that sets standards for U.S. prisons, said much behavior inside Guantanamo mirrors that of civilian prisons though the attacks with bodily fluids seem more numerous.

"It happens from time to time at facilities here, but it seems the majority of ... assaults at Gitmo were either spitting, or bodily fluids being thrown on the guards," said Gondles, who has visited Guantanamo twice at the Pentagon's invitation and reviewed the reports at AP's request.

The bodily fluid attacks are so numerous that guards now frequently wear specialized shields to protect their faces.

The incident reports show waves of orchestrated behavior.

For instance, prisoners repeatedly grabbed their guards' whistles over a five-day period in June 2004. In July 2005, guards reported several instances of rock throwing, spitting and flip-flop hitting. Rocks were hidden under shower mats, the reports said.

The incident reports also are noteworthy for information that is missing. With redacted names, it is impossible to tell whether bad behavior is widespread or the work of a few repeat offenders. Likewise, the documents don't tell whether certain guards are prone to confrontation.

Prisoners' hunger strikes, suicide attempts and threats to injure themselves aren't considered disciplinary matters and thus aren't recorded in the incident reports. Yet the Pentagon acknowledges there have been scores of such incidents.

Sen. John McCain (news, bio, voting record), R-Ariz., a prisoner of war during Vietnam, said the treatment of the guards has been overshadowed by the legal and political debates surrounding the detainees, but he has been impressed with the guards' professionalism.

"Our personnel there have perhaps the most difficult task you can have in the military outside of being in a combat zone. ... These are bad guys and some of the most hardened of hardened criminals. And some I think will need to be kept permanently," he said.

McCain said the detainees' behavior and the likelihood of permanent confinement only hastens the need for the administration and Congress to finalize detention and trial policies consistent with the Supreme Court's direction.

While Washington addresses those questions, the guards look to stay one step ahead of the detainees.

"Yes, you do get upset but you get somebody to take your place," Keen said in explaining how he survives the tensions of the cell block. "You go outside. You walk it off and you come back and (say) I want to be back in the fight."