Effective 6 June 2006; non-type rated First Officers whom are planning to operate outside of US Airspace, will be required to obtain a "co-pilot's type rating" from your FSDO.  Guidance is available from the FAA website, in FAA Notice 8000.351

http://www.faa.gov/library/manuals/examiners_inspectors/8000/media/N8000_351.pdf 

Alternately, they may be trained to type rating PTS by Flight Safety, CAE or a designated PPE.  This is crucial to port state conformity checks (ala SAFA et al).