FOC

Full Operational Capability (FOC) marks the point in a weapon system's development and fielding when it is fully ready to perform all of its designed missions. This is a significant milestone that comes after Initial Operational Capability (IOC) and indicates that all planned units have been equipped, trained, and certified, all software features are complete, and the full logistical support infrastructure is in place.

The path from IOC to FOC can take years. The F-35 Lightning II achieved IOC for the Marine Corps in 2015 and for the Air Force in 2016, but the program was not expected to reach FOC until the late 2020s as software capabilities, weapons integration, and training infrastructure continued to mature. During the IOC-to-FOC period, the aircraft was operational and deployable but lacked some planned capabilities.

FOC is important for defense planning because it determines when a weapon system can be counted on for its full contribution to combat power. A platform at IOC can fight, but it may have operational restrictions, limited weapons integration, or reduced readiness rates. FOC represents the point at which the system delivers everything that was promised in the original requirements.