<P> 15 received, with 9 in the UK and the rest in the US, where they are used for testing and training . 42 (24 FOC fighters and 18 training aircraft) to be fast - tracked by 2023; 138 F - 35B total planned </P> <Ul> <Li> Royal Air Force <Ul> <Li> 17 Squadron (test and evaluation) </Li> <Li> 207 Squadron (Operational Conversion Unit) </Li> <Li> 617 Squadron--9 delivered </Li> <Li> Unspecified squadron </Li> </Ul> </Li> <Li> Royal Navy <Ul> <Li> 809 Naval Air Squadron </Li> <Li> Unspecified squadron </Li> </Ul> </Li> </Ul> <Li> Royal Air Force <Ul> <Li> 17 Squadron (test and evaluation) </Li> <Li> 207 Squadron (Operational Conversion Unit) </Li> <Li> 617 Squadron--9 delivered </Li> <Li> Unspecified squadron </Li> </Ul> </Li> <Ul> <Li> 17 Squadron (test and evaluation) </Li> <Li> 207 Squadron (Operational Conversion Unit) </Li> <Li> 617 Squadron--9 delivered </Li> <Li> Unspecified squadron </Li> </Ul>

Fifth generation lightning ii joint strike fighter jets