Whether the SNP government is good for the people of Scotland is not the point. The point is that since forever UK service people, wherever they are posted in the world, pay the tax rate set by the U.K. Government which they get to vote for . Not the rate set by the government of the country in which they find themselves which they do not get to vote for. Unless their tour in Scotland happens to coincide with a Holyrood election that is the situation UK service people will find themselves in.