In a war, the bulk of Finland's force will be made up of conscripts. Or more accurately, people who were conscripts.

The career military men will be the officers. If you look at their officer to non officer ratio in peacetime it will be absolutely bananas compared to the UK's. Because if they do get invaded by Russia, they'll immediately call up their reserves (which due to conscription is their entire eligible population) and the ratios will make more sense.