No matter what level they are at in the RCMP or armed forces, they would be public office-holders. So if a consultant lobbyist were communicating with a person at any level there, then they would have to register. In house, they would become part...and they would have to factor in the significant amount of duties to determine whether registration was required.
In terms of monthly reporting being required, it would depend on the level the individual was at. In the regulations, the government designated seven particular positions in the armed forces. In my interpretation bulletin, I've determined that anybody at an EX-4 level or the equivalent salary range would be considered a designated public office-holder, and any communication that had have been arranged with those individuals would have to be captured in the monthly report.