FMS Foreign Military Sales
The US government-to-government process for selling defense equipment and services to allied nations, run by the Defense Security Cooperation Agency.
FMS is how most US-made defense systems reach allied militaries: not as a direct company-to-buyer sale, but as a purchase from the US government itself, which then arranges delivery from an American manufacturer. It is run by the Defense Security Cooperation Agency (DSCA)1 under the Arms Export Control Act, and it is the default channel for major hardware like fighter jets, air-defense batteries, and warships once a sale clears ITAR review.
The alternative route is a Direct Commercial Sale (DCS), where a US company sells and exports directly to a foreign buyer under its own State Department license, with the government mostly out of the transaction beyond approving the license itself. FMS deals tend to carry more US government oversight, standardized contracting, and built-in training and logistics support; DCS deals tend to move faster and give the manufacturer more direct control over terms. Governments often use FMS specifically because it comes bundled with the same maintenance, spare-parts, and training pipeline the US military itself relies on, which matters more over a 30-year airframe life than the sale price alone.
Why FMS figures are hard to compare directly
An FMS “sale value” reported in news coverage is frequently a program ceiling, the maximum the US Congress has approved for a potential deal, not the actual contracted price a country ends up paying. That gap is one of the reasons unit-cost figures for the same aircraft or system can vary so widely across sources; see our weapon price transparency gap piece for how WeaponSpecs treats published cost figures across the database.
Sources
Related on WeaponSpecs