Iraq sites can often be contaminated by depleted uranium from Desert Storm and the Iraq War.
DU used in AP ammunition, as well as penetrating bombs (used against buildings and bunkers for example). Saddam had a lot of NATO munitions from the Iraq-Iran war in those bunkers we blew up as well, some of which probably had DU.
American G.I.s told to stay out of burnt out Iraqi armor in Iraq, but either to get their glory pics taken, collect souvenirs, or (in my case) trying to salvage some armor or blister shields to use in up-armoring our own soft-sided vehicles for use in-country, soldiers get exposed to DU residue.
Also, many buildings were hit in Iraq with what were probably DU tiped bombs. The Ministry of Information is one I can think of. My Heavy Search and Rescue Team (one of many jobs) trained in bombed out buildings like these... as part of our mission was to enter bombed out structures to look for survivors, sensitive documents and equipment if necessary, if insurgents started to drop buildings around Baghdad. Shoring, blocking, & bracing of compromised structures, work in confined spaces, patient packaging and extraction, and rope work.
This put us in contact with DU residue as well. Some units have reoccupied many of these bombed out shells, braced them, and turned them into working and living areas. This also exposes soldiers to DU.
Never heard of any thorough surveys being done as the how wide spread DU residue exposure actually is in country. Or of any testing of soldiers, living and working areas, or equipment for contamination to DU (among other hazards).