I knew a soldier had to ask permission from his commanding officer to marry. There are rare examples of a soldier having 2 wedding ceremonies, possibly because he didn't ask permission for the first one.
More about Irish Constabulary, including marriage regulations:
https://www.irishfamilyroots.com/post/the-royal-irish-constabularyMembers of the County Constabulary had to be under 40 years of age, of good character, able to read & write. Recruits should be single, aged 19-27 and 5 feet 9 inches tall. Marriage was allowed, with permission, after 7 years service. Constables were usually stationed away from their or their wife's home
county.
I don't know if the same rules applied to the Peace Preservation Force. Some members of PPF who tried to join the Irish Constabulary weren't suitable because their literacy was inadequate. Source: Chief Secretary's Office Registered Papers
RIC database is also in National Archives Ireland.
Book "The Royal Irish Constabulary: A short history and genealogical guide ..." by Jim Herlihy
Facebook group Royal Irish Constabulary. Includes a link to a forum with a genealogy section. Commemorative service at St. Paul's Cathedral, London in April this year, centenary of formal disbandment.