Germany manages with 11 - we probably have over 40
We're not even comparing apples and pears more like apples and onions...Germany simply does not have the political, geographic and military conditions of the UK.
Think what would happen if the UK were attacked, what contribution could Germany make. Then think of the opposite situation in terms of allies coming to the aid of the UK.
Please don't mention the UN, or even NATO, in todays world you don't even know who will be up for helping out.
We should be maintaining at least a decent defensive state for those wars yet to be fought. That means keeping, supporting and upgrading appropriately placed bases.
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