GUANTANAMO BAY NAVAL BASE, Cuba--Terrorist suspects have become more compliant and are offering up many more important intelligence tips, says the U.S. Army general who commands the prison where preparations are under way for expected military tribunals.

Maj. Gen. Geoffrey D. Miller said that three-fourths of the 660 or so detainees have confessed to some involvement in terrorism. Many have turned on former friends and colleagues, he added.

Miller said detainees are giving up information in ''incentive-based interrogations.'' Rewards include more recreation time, extra food rations, or a move to the prison's medium-security facility.

''We have a large number of detainees who have been very cooperative describing their actions, either terrorist actions or in support of terrorism," Miller said Wednesday.

Tips have led to more arrests; others have revealed terrorist recruiting techniques, he said.

Some detainees have become more talkative, said Army Spc. Brenda Gustyn, 26, a guard.

''Many joke around with me, asking me if I want to be one of their wives,'' she said.

Rep. Jan Schakowsky (D-Ill.) will travel to the base Saturday to inspect the treatment of the captives.

She is making the trip because of her "growing concerns and growing questions about the legality of the Bush administration policies to hold these detainees,'' spokesman Nadeam Elshami said.