A service battalion (Svc Bn; French: bataillon des services or bon svc) is a unit of the Canadian Armed Forces (CAF) that provides combat service support to a brigade group and its elements.

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It is able to fight in a defensive role as well as provide the vital logistical support to sustain the operations of the other units within the brigade group.

This is different to the "(service) battalion" designation in use in the British Army in 1914–1915 onwards. Such battalions were for war service only, having a temporary nature, like that of the bataillon de marche [fr] concept of the French Army.^[1]

Service battalions are normally subdivided into:

• A battalion headquarters (Bn HQ), concerned with overseeing the effective training and employment of all companies within the battalion. The HQ usually consists of the command staff, an orderly room, an operations cell, and a training cell.
• A transportation company (Tn Coy), which provides transportation and movement support, both tactical and administrative, to the brigade.
• A supply company (Sup Coy) which provides general supply support to the brigade.
• A maintenance company (Maint Coy), which provides automotive, mechanical, electrical, weapon maintenance and support to the brigade.
• An administration company (Admin Coy), which provides internal service support (signals and communication, transportation, supply, maintenance, food services, and military police support) to the battalion and its elements.

The unit flag of a service battalion is steeped with the traditions of its founding corps. The flag is a tri-color with the top and bottom equaling 2/5ths of the height each and the centre equaling 1/5th of the height. The official colours of the unit flag are Oriental blue (top) and marine corps scarlet (bottom) with an intervening gold stripe. Then it has a large white Arabic numeral representing the number of the service battalion emblazoned on both sides in the flag's centre. These regal colours have a long history of association with army services. The Oriental blue colour of the flag is reminiscent of the Royal Canadian Ordnance Corps (RCOC) flag while the gold colour can be found on the former banners of the Royal Canadian Army Service Corps (RCASC), the Royal Canadian Electrical Mechanical Engineers Corps (RCEME), and the Royal Canadian Army Pay Corps (RCAPC). The scarlet colour may have some reference to the Royal Canadian Army Medical Corps (RCAMC); the militia medical companies were, for a short period in the early 1970s, incorporated into the service battalion organizations. More correctly it refers to the scarlet accoutrements on the RCOC and RCEME dress uniforms earned through its close association with the Royal Canadian Artillery in the early 1900s. This flag was designed by Chief Warrant Officer Phil Raven during his time as regimental sergeant major of 2 Service Battalion in the 1970s.

The following are the current service battalions in the CF, by brigade:

Although Canadian service battalions were a product of the Cold War and were expected to operate as complete units in support of Canadian Army brigades and brigade groups in the field, since the September 11 terrorist attacks, the non-linear battlefield has meant a shift towards the provision of service support to ongoing operations, e.g. in Afghanistan being provided by National Support Elements, tailored to the task at hand and not necessarily formed of just one service battalion. Service battalions are now thus largely force-generation units, and provide essential support in garrison.

LCol John Conrad bleakly described the evolution of Canadian logistics in his book, What the Thunder Said: Reflections of a Canadian Officer in Kandahar. He deployed to Afghanistan with an establishment capped at 300 all-ranks that almost failed to fuel, fix and feed troops during Operation Medusa in the summer of 2006. The doctrine, he describes, was unprepared for the intensity of mobile 360° warfare. At one point the planners lost count of LAV III cannon ammunition just as the battle group was firing much more ammunition than any calculation tables predicted. He also wrote about his own command group hitting an improvised explosive device west of Kandahar City, conducted the response drills then summoning his administration clerk with mock gravity to draft CF52 General Allowance Claim to replace the underwear he soiled. Conrad's book is a surprising but rare glimpse inside the logistics function in battle.

• 1 Service Battalion on Canadian Army Journal