“The value is that you can move these quickly,” she said. “They are mobile launch systems, in some cases man-portable. We don’t know how high the Reaper was flying. Based on the released video, it may have been relatively easy for them to shoot down, but it still indicates they retain some remaining air defence capability.”

Iran’s larger air defence network has been badly damaged. It was built around older radar-guided surface-to-air missile systems, including domestically produced batteries and Russian-supplied missile defence systems such as the S-300. Israeli and US attacks are widely believed to have degraded much of that network.