NO -based from what I have gathered.
I do however like flexible units/soldiers. What I mean by that, is essentially the unit will not be "eternally set in stone" once its created. Im assuming that soldiers won't die of old age (for gameplay reasons) ... so I see older soldier units being able to be "recycled" ... that is, take the units and their experience level, re-train and re-equip them, and reduce their level according to how much new training they need. Say, if their "first" bootcamp was 3 months, and this bootcamp is three months, divide experience/level by half, however if this new training is 6 months, their level is reduced to a third. (9 months of total training divided by the 3 months of original training their battles were based upon)
Or if you wan't to be really simplified, simply half their experience everytime they are re-trained. (however if training is divided into several key elements, an elite unit recycling into an uberelite unit should only require a small percentage, say 10% new relative training time ... therefore their level/experience will only be reduced by 10%.
equipment would have no effect on new level, since its assumed the soldiers will be equiped before training begins (otherwise there would be an inherent over-lap ... which would just be weird ... and also you need to be trained for your equipment). Also time it takes for the equipment to be made will have no effect on level ... only actual new "training" will reduce their relative level proportionally.