I think the idea of syncing the cycles sounds like a great idea but its one of those ideas that only looks good on paper. If it was just a matter of doing that it would work but by the time you factor in such things as illnesses, injuries, other medical issues, retirements, releases, promotions, disciplinary matters, training requirements for career courses, other assorted training issues, administrative matters, qualifications required by a Unit or tasking and a whole host of other potential disruptions to the plan of keeping people in place longer it quickly becomes a much less attainable objective.