In Vietnam over half the wounded developed Acinetobacter Baumannii infections, though it wasn't the drug resistant variety in Iraq today.
 
Increasingly this looks like it mirrors Vietnam in that the infections are near water sources. Granted soil samples match DNA profile for some of the hospital infections, its hard to determine what is the exact method of introduction.
 
Its thought that open wounds might be infected by the soil bacteria, but some of the infections are a variety generally found in contaminated hospitals.
 
This is the genome type:

Acinetobacter is a water loving bacteria. So its possibly being spread through lavage equipment in ICU's. Mainly head injury cases. As the contaminated water sprays the room the droplets in the air are respirated by the host, which could turn onto pneumonia. The bottom map shows the pneumonia cases in Iraq. Along the Tigris and Euphrates rivers.