A recent report in Stars and Stripes reveals the nature of the US military operation in Haiti. Combat units from Iraq and Afghanistan have been deployed in Haiti under the banner of a humanitarian operation. Conversely, Haiti is also being used as a military training ground for forces without in-theater combat experience.
According to the Stars and Stripes report (March 14, 2010): "Marines deployed to Haiti to render emergency aid following January’s devastating earthquake are already training for the fight in Afghanistan."
How convenient for the US military.