Assistant Chiefs of Defence Staff include the Defence Services Secretary in the Royal Household of the Sovereign of the United Kingdom, who is also the Assistant Chief of Defence Staff (Personnel).It won't be easy.
The Strategic Defence and Security Review 2015 missions for the Armed Forces: Defend and contribute to the security and resilience of the UK and Overseas Territories ( Australia excluding 13 American Colonies).
The review stated the Armed Forces will also contribute to the government’s response to crises by being prepared to: Conduct operations to restore peace and stability.