The Future Rapid Effect System (FRES) was the name for the British Ministry of Defence (MOD) programme to deliver a fleet of more than 4,000 armoured fighting vehicles for the British Army. The vehicles were to be rapidly deployable, network-enabled, capable of operating across the spectrum of operations, and protected against current threats. The programme has now been split into two separate procurement projects for a reconnaissance Specialist Vehicle (SV) and an aspiration for a future Utility Vehicle (UV). The General Dynamics Ajax was selected to fulfill the SV requirement in 2016.

The Ajax, formerly known as the Scout SV, is a group of armoured fighting vehicles being developed by General Dynamics UK for the British Army. It has suffered serious development and production difficulties.