The Chair of the Police Federation for Northern Ireland, Mark Lindsay, has paid tribute to the thousands of men and women who served in the Part Time Reserve over the past 50 years.
During the Troubles, 52 Part Time Reserve police officers were murdered and hundreds suffered physical and psychological injuries during their service. Nine were murdered after they left the service.
The Part Time Reserve became part of the RUC on June 1, 1970.
Mr Lindsay said: "Close to 10,000 men and women stepped up to the plate and gave outstanding service to this entire community.
"They knew that by putting on the uniform they would become a target for terrorists. It is a measure of their courage and commitment that they stepped forward to serve during dark and dreadful days.
"These brave officers had day jobs and were then prepared to turn out for their shift as Part Time Reserve officers.
"We owe them a deep debt of gratitude."