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What a bizarre comment. Honestly, do you live in Canada? Even if you live in China, don't you have VPN? I am really surprised by some of the comments I read in this forum. You seem to be so interested in HK and yet know so little about it. Even if you don't speak English, there is a lot of information about HK online.
The National Service in the UK ended in the 1950s but those who live outside the UK never needed to serve anyway, HK and Canada included. HK had its own voluntary army, which was similar to the reserve here in Canada, called "The Volunteers". The Volunteers was formed by our local British citizens, and it suffered lots of losses during WWII. We also had paramilitary groups like the Auxiliary Medical Services, the Civil Aid Service, etc. staffed by regular HKers part-time. The British Forces in HK recruited full-time local servicemen for the army, navy and the air force, etc. but they were separated from the regular British Forces from the UK. I had school friends who served in all three, and so did one of my uncles. The military in pre-1997 HK, the UK and Canada are professional, i.e. people join the services to follow a professional career and it is not conscription.
Before 1997, HK was actually responsible for 75% of the expenses of the British Forces stationed in HK.