“There is just no predicting that,” Colonel Pagel said. “There are just too many variables.”

Each of the 14 cases now pending presents legal tangles. In one, the morass grew so thick that the judge scheduled pretrial proceedings after the date he had set for the trial, evidently realizing that there were too many unresolved issues to rush the case. In another, a detainee refused to leave his cell for an arraignment and had to be forcibly extracted.

On Wednesday, proceedings were delayed when a detainee complained that the tribunal translation was flawed. After that was resolved, the detainee, Ahmed Mohammed Ahmed Haza al Darbi, declared the proceeding political and refused to participate, adding, “History will record these trials as a scandal against you.”

Prosecutors planned this week to arraign two suspects, one who they say was a Qaeda paymaster and the other, they say, a propaganda chief. But that rudimentary step is not to go off as they had hoped. The case of the propaganda chief had to be postponed because his military lawyer had recently left the defense office, taking that case back to its starting point.

By chance, the alleged paymaster and the alleged propaganda chief were the first ones identified for war crimes trials by the Pentagon back in 2004. Yet all Guantánamo cases were derailed in 2006 when the Supreme Court struck down the Bush administration’s first war crimes system.

The first trial of a detainee under the new system is now scheduled for May 28. But defense lawyers for that defendant, Salim Ahmed Hamdan, who was a driver for Osama bin Laden, have filed nearly 30 legal motions, raising questions that included procedural issues and basic challenges to the Guantánamo system itself.

Andrea J. Prasow, one of Mr. Hamdan’s lawyers, said her experience in a comparatively simple Guantánamo case showed the extraordinary complexities that seem certain to entangle all of the battles here.

It may be possible, Ms. Prasow said, for one or two cases to be tried by the fall. But, she said, “I don’t see how it is remotely possible for the others to get under way.”