I said there were no contributors from the Unionist community.
As an outsider, I have talked of "your" problems etc. as opposed to "ours" (mainland) See my 27 Mar. 0950 AM

Here is a piece by a Catholic who was in RUC in 70s.
He makes it clear there were a number of such.
http://news.bbc.co.uk/1/hi/uk/1634688.stm
Some notable Catholic RUC men were Chief Constable Sir James Flanagan KBE (Derry), Deputy Chief Constable Michael McAtamney, Assistant Chief Constable Cathal Ramsey, Chief Superintendent Frank Lagan [19] as well as RUC Superintendents Kevin Benedict Sheehy (Glengormley) and Brendan McGuigan.