Field Artillery Battalion 30th Field Artillery Battalion 8th Combat Engineer Battalion - () 11th Signal Corp Battalion - () 3rd Army Support Command - () 23rd Transportation Battalion - () 23rd Logistic and Service Battalion - () 23rd Maintenance Battalion - () 23rd Ordnance Battalion - () 23rd Signal Corp Battalion - () 23rd Combat Medical Battalion - () 3rd Development Division - () 3rd Development Regiment - () 3rd Development Battalion - () 3rd Combat Engineer Regiment - () 301st Combat Engineer Battalion - () 302nd Combat Engineer Battalion - () Military Districts - () 31st Military District - () 32nd Military District - () 33rd Military District - () 34th Military District - () 35th Military District - () 36th Military District - () 37th Military District - () 38th Military District - () 39th Military District - () 310th Military District - () 4th Army Area () – headquartered in Nakhon Si Thammarat, responsible for southern Thailand, it is the area that serves as the frontine command for those engaged in South Thailand insurgency. US State Department cables leaked by WikiLeaks in 2006 said: "Military forces totaling approximately 35,000 troops fall under the command of the 4th Army....the 5th Inf Div and the 15th Development Division (three regiments) totaling approximately 20,000 troops are the main units of the 4th Army." 5th Infantry Division - () – (Fort Thep Satri Srisunthorn, Nakhon Si Thammarat Province) 5th Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion 15th Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion 25th Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion 5th Field Artillery Regiment - () 9th Field Artillery Battalion 15th Field Artillery Battalion 25th Field Artillery Battalion 105th Field Artillery Battalion 16th Cavalry Squadron - () 5th Reconnaissance Cavalry Company - () 5th Combat Engineer Battalion - () 5th Signal Corp Battalion - () 5th Combat Medical Battalion - () 5th Long Range Reconnaissance Patrols Company - () 15th Infantry Division - () – (Fort Ingkhayutthaborihan, Pattani Province) 151st Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion 152nd Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion 153rd Infantry Regiment - () 1st Infantry Battalion 2nd Infantry Battalion 3rd Infantry Battalion Service Support Regiment, 15th Infantry Division - () Transportation Battalion