Other U.S. Army units to have occupied the city include the 4th Brigade Combat Team of the 1st Cavalry Division, the 172nd Stryker Brigade, the 3rd Brigade-2nd Infantry Division, 18th Engineer Brigade (Combat), Alpha Company 14th Engineer Battalion-555th Combat Engineer Brigade, 1st Brigade-25th Infantry Division, the 511th Military Police Company, the 812th Military Police Company and company-size units from Reserve components, an element of the 364th Civil Affairs Brigade, and the 404th Civil Affairs Battalion, which covered the areas north of the Green Line. The 67th Combat Support Hospital (CSH) Deployed in support of Operation Iraqi Freedom (OIF) from January 2004 to January 2005 running split based operations in Mosul and Tikrit. The Task Force (TF) 67 Headquarters and Company B operated out of Forward Operating Base (FOB) Diamondback (Mosul), and Company A operating out of FOB Speicher (Tikrit).