2 Tech Crew
Lost again. Doesn't matter how you look at it, replacing one flight crew member (F/E) with two technical ground crew is not cheap. Those two personnel are not available at home base, so either the maintenance crews are left short at home or additional personnel are required to be brought on strength. Maybe a technically qualified Loadmaster, such as was the case with the Caribou (in the days when they were classified as Loadmasters, later Creman Tech, and finally Flight Engineer) but were in fact also the "flying spanner". As for the Nav's, I expect a Nav is carried on Tactical sorties where the "J" is used in that role.