RSR (required supply rate)

Required supply rate (RSR) is a NATO and allied defence logistics term. It is the estimated amount of ammunition, expressed in rounds per weapon per day for items fired by weapons, and of all other supplies, expressed in an appropriate unit of measure per day, needed to sustain the operations of a designated force without restriction for a specified period. The French equivalent is taux de ravitaillement requis.

RSR is a requirement rate, not an availability rate. It states what commanders would expend if supply were unlimited, before stock on hand, transport capacity or storage are considered. Canada uses the term through its NATO membership and common allied terminology, so Canadian suppliers working with defence customers will meet it in allied doctrine and planning discussions.

How NATO defines required supply rate

The definition comes from NATO's terminology standard, AAP-06, which is mandated by STANAG 3680. National glossaries then repeat it almost word for word. The UK's JSP 886 logistics glossary cites AAP-6 for its entry on Required Supply Rate and uses the same wording on rounds per weapon per day and units of supply per day. US joint and Army glossaries use the phrase "required supply rate (ammunition)" with the same meaning.

Four elements define the term. It is an amount of supply. It is expressed as a daily rate. It is tied to a specific weapon or item. It is unrestricted, so it reflects operational need rather than what logistics can deliver.

How units build and report an RSR

RSR is a bottom-up signal. In US field artillery doctrine, determining the RSR is the first step in ammunition planning for a specific operation. The battalion operations officer (S3) starts from published planning factors, adjusts them for the type of operation, the number of weapons to be armed and the targets to be engaged, and forwards the result through command channels. Each higher echelon consolidates and reviews the figures before they reach corps or theatre level.

Units express RSR in the unit that fits the system. Artillery uses rounds per weapon per day for each munition type. Rocket systems that load in packages use complete packages per launcher per day, such as rocket pod containers. Broader logistics use extends the idea to litres of fuel per vehicle per day or rations per person per day. ATP 4-42 describes how units determine their ammunition requirements and submit required supply rate reports to the next higher headquarters.

RSR compared with CSR and ASR

Two related rates sit beside RSR. The controlled supply rate (CSR) is the rate of consumption that can be supported given availability, facilities and transportation. Higher commands set it after considering subordinate units' RSRs and the ammunition expected to be available. Units may not draw above their CSR without authorization. The available supply rate (ASR), used in NATO fire support doctrine in AArtyP-5, represents what is readily available.

Together the three rates create a dialogue between need and feasibility. RSR states the need, CSR states what is allowed, and ASR states what is on hand. NATO's terminology also places RSR next to "level-of-effort munitions" and "standard day of supply". Both concepts depend on a daily expenditure estimate, which RSR supplies. The US Army's sustainment at speed and range article discusses supply discipline through required and controlled supply rates in multi-domain operations.

Why RSR is not a single flat daily figure

The formal definition is a rate per day, but practitioners argue it should not be treated as a straight-line quantity in large-scale combat. Writing in Military Review, US sustainment authors describe forecasting ammunition needs by phase of operation, using projected volume of fire. In one division warfighter exercise, teams forecast expenditure up to ninety-six hours out. This allowed resupply planning two days earlier than a straight-line RSR would have indicated. Higher echelons also use automated tools, such as the Operational Logistics (OPLOG) Planner, to compute RSR across large operations.

What RSR means for a supplier bidding on Canadian public contracts

RSR is an internal planning input, and public Canadian solicitations rarely name it. Suppliers are more likely to see delivery quantities and schedules that reflect planning work behind the scenes. When RSR assumptions change with operational scenarios, the demand profile can change with them, even if the contract never uses the term.

Bid teams should recognize the term in allied documents, tender discussions and defence logistics material, and read quantity and schedule requirements with that planning logic in mind. Public federal reporting is a useful starting point, including the Auditor General's audit of ammunition for the Canadian Armed Forces and records on the Government of Canada's Open Science and Data Platform.