Kirkush Military Training Base was a United States Army installation near the city of Balad Ruz in Diyala Governorate, Iraq.
Caldwell was assigned to the 404th Aviation Support Battalion, 4th Infantry Division, Fort Hood, Texas.
The entire facility covers about 100 acres (0.40 km2) and has several medium size groups of buildings called pods.
FOB Caldwell was located in a complex that was within Kirkush Military Training Base (KMTB), Iraq (Mercator Grid Reference System 38SNC 22027 30374) is approximately 70 miles (110 km) east of Baghdad, close to the Iranian border.
Coalition Military Training Team (CMATT) Advisors to the Base Operations, Iraqi CG, Base Defense Team 2005-2008 FOB Caldwell was dissolved into the larger KMTB on April 3, 2010 and turned over to the 5th Iraqi Army Division.