..such as 3-D printers, rapid proto-typing machines, and three dimensional modeling software, combined with the holigraphic technologies already mentioned;
It will finally be possible to get soldiers on demand, in either hard or soft copy, in whatever uniform, regiment, date, size and physical condition you want them in. In the case of hard copy, you can also get the posses and paint job you want too. Soft copies need not freeze these options.