At the business end of defence management in the United Kingdom there is, from time to time, a period when a number of senior departures fundamentally affect the nuance in which the long-term plans for the Department are thought through.
Either by accident or design, Sir Bill Jeffrey also has a (literally) once in a lifetime opportunity to overhaul the MoD's management style because there are so many almost-simultaneous changes in the top management team. But observers fear that he won't, either because of timidity or because civil service leopards can't change their spots, whatever they might say.