4th Infantry Division (Philippines)

The 4th Infantry Division, Philippine Army, known officially as the Diamond Division, is one of the Philippine Army's infantry units in Northern Mindanao.

History
On January 15, 1946, right after the World War II, upon the reestablishment of the Commonwealth Government, all Military Districts were converted to military areas; Pursuant to Section 1 General Orders Number 46 of HAFP dated January 8, 1946. The 1st and 2nd Military Areas (IMA-IIMA) was in Luzon, while 3rd Military Area (IIIMA) in the Visayas, and the 4th Military Area (IVMA) in Mindanao. The remaining forces of the 10th MD were absorbed to Military Police Command (MPC) based at Camp Overton, Iligan.

Mission
4th Infantry (Diamond) Division conducts internal security operations to dismantle four (4) priority New People's Army fronts and degrade three (3) priority New People's Army areas in Caraga region and portion of Region 10 by 2009 to attain a physically and psychologically secure environment conducive to continuous development.

Brigades
The 401st Infantry (UNITE ‘N FIGHT) Brigade, 4th Infantry (DIAMOND)  Division, Philippine Army traces its humble beginnings from the 4th Infantry Brigade, 4th Infantry Division; the 1st Infantry (1/4)Brigade, 4th Infantry Division; and to its present designation - the 401ST Infantry Brigade, 4th Infantry Division, Philippine Army. On 15 July 1973, the 4th Infantry Brigade was renamed “1st Infantry Brigade”.
 * 401st Infantry (UNITY) Brigade (Prosperidad, Agusan Del Sur)
 * 402nd Infantry (STINGERS) Brigade (Butuan City, Agusan Del Norte)
 * 403rd Infantry (PEACEMAKER) Brigade (Malaybalay, Bukidnon)
 * 404th Infantry Brigade (Transferred to 10th ID and now 1002nd Brigade)

Battalions

 * 8th Infantry (DEPENDABLE) Battalion
 * 23rd Infantry (MASIGASIG) Battalion
 * 29th Infantry (MATATAG) Battalion
 * 30th Infantry (PYTHON) Battalion
 * 36th Infantry (del fierro VALOR) Battalion
 * 26th Infantry (EVER ONWARD) Battalion
 * 58th Infantry (DIMALULUPIG) Battalion
 * 75th Infantry (MARAUDER) Battalion
 * 88th Infantry (MARINGAL) Battalion

Service Support Units (SSU)

 * Camp Evangelista Station Hospital (CESH)
 * Headquarters and Headquarters Service Battalion (HHSBn)
 * Service Support Battalion (SSBn)
 * 4th Division Training School (4DTS)
 * 4th Army Training Unit (4ATG)
 * 4th Field Artillery Battalion (4FAB)
 * Civil Military Operations Battalion (CMOBn)
 * 10th Forward Service Support Unit, ASCOM, PA (10FSSU)