The trouble with RN harmony is that it works on the assumption that people will alternate between sea and shore postings, so over the course of 2 tours it averages out at more like 33% of the time away (although probably a bit more like 40% if there is an out-of-area during the shore posting - hmmm, 40% sounds a bit like the other 2 services' harmony!). Trouble is with the F-35 fleet there won't be enough shore postings that will allow guys to maintain their expertise. So we will either need to rotate people in and out of the F-35 fleet to other aircraft types every 2-3 years, with commensurate loss of experience, or we'll need to give them back-to-back tours working at a 66% deployment ratio. It can undoubtedly be sold to eager 20-somethings but the only people that stick around in the F-35 force long enough to become tactical expert QWIs or seasoned COs will be the kind of sociopaths who don't give a monkeys about family life... hang on, that might just work :-)