To qualify as prisoners of war under the Geneva Convention, Jonah, detainees must satisfy all four of the following criteria (the quotations here come from the Convention itself):
***The detainees in question must have been “commanded by a person responsible for his subordinates”
***They must have worn “a fixed distinctive sign recognizable at a distance”
***They must have carried their arms “openly”
***And they must have conducted their operations “in accordance with the laws and customs of war”
When the detainees in question are terrorists, they might satisfy the first criterion, but they certainly do not satisfy the remaining three. On the law, then, Rumsfeld is correct, Will and Zakaria flatly mistaken.