As an aside, Jade is pretty sure this remains accurate, along with a small side dose of longing. Humans-turned-troopers-turned-free-soldiers don't
completely recall their past lives and are impossible to recognize, remembering just enough blurry fragments to have a vague idea of what they gave up in their misguided attempt to serve a supposedly benevolent government.
Jade is pretty sure they used cardboard-covered steel targets, but the same idea remains the same. As previously mentioned, Jade will give XCOM credit for genuinely believing what they do is necessary. She just doesn't like it and is too uncomfortable to look too closely at what they did.
From what Agneyastra can tell, the humans are just as clueless about how the turret code is read — not only is it not on binary, but uses untranslated alien lettering. They just found and adjusted a few portions based on heavy trial and error, then added comments to those portions in their own language.
EDIT: If the above makes any programmers in the playerbase cringe and ask "
Why," you're one step closer to understanding how the aliens keep their relatively unsecured code secure.