BEags, I'm sure you're talking in general terms across the FTS, but in the RW world the process happened back in 97/8 with DHFS. There, an instructor Civ:Mil mix of 40:60 would appear on the surface to be fine, however 10 years down the line your worries are starting to manifest themselves now, with contractors seeking to raise the Civvy QHI retirement age to 65, together with regular revolts among the staff crewrooms for more pay (recognising the impending rarity of suitable civvy Beefers)