TomJoad is correct -a country's armed forces more or less reflect their own view of their place in the world
The UK (and almost certainly England) still believes we should be able to fight in the front line against just about anyone across much of the globe
Maybe the Scots will be happy to have a policy similar to Ireland , Iceland or Faeroes
The only problem is that the English (rightly) suspect that if something goes wrong it'll be us bailing Scotland out of the hole again