My earlier post has provoked some excitement. A few of points to bear in mind.
1) I asked questions. I didn't supply answers. Few of you commenting have addressed my questions.
2) The issue of obsolescence of weapons of war is very often not a matter of whether they can be defeated in a straight fight with another weapon. The longbow did not become obsolete because other weapons had greater range, destructive power, or firing rate (indeed, it was probably centuries before the competitor weapons outstripped the longbow in these regards). Similarly, the obsolescence of the battleship or tank is not primarily a matter of, say, in the case of the tank, lighter faster transport vehicles being more resistant to destruction by shells or able to deliver greater punch themselves. Very often, obsolescence occurs because the nature of relevant combat changes. If people stopped charging at you across muddy fields, the value of longbows will decline. Sea battles and battles between land armies have changed in ways that render battleships and tanks obsolete.
Similarly, the point about drones is not that, any time soon, they could defeat manned fighters in straight combat. Few defence authorities dispute that the next generation of manned fighters will be the last, because warfare will change in ways that will make traditional fighters irrelevant. There is of course defence value in participating in that final generation, specifically in the (highly unlikely) scenario that we faced an opponent that did have final generation fighters. But there is also a cost. My question is whether there is an option of skipping a generation of weapons? What would a final generation fighter plane really be for for the UK?
3) I did not propose abandonning nuclear weapons. I questioned whether we wanted the Trident II system. It is a typical move of fans of Trident II for them to suggest that the only options are Trident II or not having nuclear weapons at all. That's not correct. There are other options.
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