This is a first. Never before has a field manual become law. FMs were always meant to provide guidance. Not anymore:

Effective immediately, an individual in the custody or under the effective control of an officer, employee, or other agent of the United States Government, or detained within a facility owned, operated, or controlled by a department or agency of the United States, in any armed conflict, shall not be subjected to any interrogation technique or approach, or any treatment related to interrogation, that is not authorized by and listed in Army Field Manual 2 22.3 (Manual).

The rest of the executive order:

http://www.globalsecurity.org/intell/library/policy/national/090122-exec-order_interrogations.htm

Well, I had this memorized for years (as did all our enemies of state):

http://www.army.mil/institution/armypublicaffairs/pdf/fm2-22-3.pdf

Pick your favorite. (Note it was updated in 2006 - how interesting cya)

Keep in mind that whenever a FM references other FMs or regulations, those have to be adherred to as well. Interesting that instead of a practice (guidance) (FM) being in accordance with all laws and military regulations, now everything is in accordance with a FM :o)