These were a group of Hong Kong residents, but from a wide range of backgrounds and nationalities, who trained as soldiers to defend Hong Kong.
Wikipedia's page, Royal Hong Kong Regiment, gives a timeline of the various names used to describe this group over the years:
|1854||1854||Hong Kong Volunteers|
|1862||1866||Hong Kong Volunteers|
|1878||1917||Hong Kong Artillery and Rifle Volunteer Corps|
|1917||1920||Hong Kong Defence Corps|
|1920||1949||Hong Kong Volunteer Defence Corps|
|1949||1951||Hong Kong Defence Force*|
|1951||1961||Royal Hong Kong Defence Force*|
|1961||1970||Hong Kong Regiment|
|1970||1995||Royal Hong Kong Regiment (The Volunteers)|
* - The history page at https://www.rhkr.org/history.htm notes that during the years 1949 to 1961 the Hong Kong Defence Force and the Royal Hong Kong Defence Force included naval and air force units, as well as the soldiers in the group that this page describes.