After the failed uprising on Kamino in 12 BBY, Emperor Palpatine came to the conclusion that an army of clone soldiers was far too susceptible to corruption. Thus, he expanded the Stormtrooper Corps to include clones that were created from a variety of genetic templates, effectively marginalizing Jango Fett's progeny into a minority status.[13] In addition to the massive influx of new clone sources, the Corps began recruiting real Human beings to serve in the ranks as enlisted stormtroopers.[19]
If a man between the ages of 18 and 30 scored in the top fifth percentile, an Imperial recruiting agent would contact him and presumably arrange for the extraction of a DNA sampling for cloning. Men who did not score high enough to qualify as a genetic template were still used as regular soldiers. Also, it was preferable if enlisted troopers met a certain standard in height and weight.[source?] Princess Leia Organa was seemingly familiar with Stormtrooper Corps's standards by 0 BBY, perhaps as a result of her work with the Imperial Senate.[2]
For a time, the Stormtrooper Corps remained evenly balanced between clones and recruits, at least until the onset of the Imperial Civil War, which occurred alongside the ongoing Galactic Civil War. Due to the loss of Kamino and its cloning facilities, as well as many other cloning centers throughout the galaxy, clone stormtroopers became a rare commodity that the Empire could no longer afford to sustain.[30] As the Galactic Empire's unity became undermined by various splinter cell factions, a few successor states opted to vastly reform the Imperial recruiting policy. Unlike the old Empire, the Empire of the Hand recruited stormtroopers from a variety of Humanoid sources. Though the stormtrooper ranks remained consistently dominated by Human male recruits, it marked the first time that Non-Humans were allowed to serve as Imperial soldiers.[27]