RM AA isn't worth it, so you want to run with engis,reps only unless oyu intend to use HHs.
So basic:
1x BO
2 xGunners (RM has very high reload growth but any sailor will cap, so base isnt that important unless you want to play skillless WaW. If you run elite reload gunners for RM in WaW you will have a maschine gun like reload)
1x Scout
For +12s and just 100vets+full experts:
6x engis, 4x reps
For elite and/or high # of vets:
7x engis, 3x reps
Elite reps and 12/10/10 enigs and near vet cap this may work best (havent done math but RM has the 2nd best reps allowing them to hit rep cap easier:
8engis, 2x reps
edit:
If you want to run with HHs I would recommed to run just 1 gunner for the HHs, since RM BB6+5 and of of the 4s have so many t-slots that 1 gunner offeres enough firepower to nuke any sub. So run 1Bo,1scout,3Gunner,3-4reps,5-6engis for HHs
