this is what the RAAF thinks regarding foc and ioc
Initial Operational Capability (IOC)
IOC can be declared when
one or more subsets of the capability can be deployed on operations. IOC considers the personnel, training, major systems, supplies, facilities and training areas, logistics, support, command and management required to deliver the subset of capability required.
Final Operational Capability (FOC)
Final Operational Capability is declared when the
entire capability can be deployed on operations. FOC considers the personnel, training, major systems, supplies, facilities and training areas, logistics, support, command and management required to deliver the full capability required.
Capability - Royal Australian Air Force
LAC is gonna get its IOC after a week and when its production starts till the next 20 aircrafts all the supplies,logistics and doctrines for the bird are developed after which its will be given FOC which means its battle ready and the next 20 aircrafts will be delivered after FOC