Security GEN1 inconsistency?

First off, I want to apologise if ‘inconsistency’ was the wrong word to use or if I spelt it wrong in the title. Now then…

I’m a little confused about a very minor matter Regarding the Security GEN1 helmet in Halo 5. The GEN1 helmets are named as such because they are, quite literally, the helmet designs from Reach and 3, right? Heh, and believe me, the difference in design quality between them and the Halo 5 versions is so noticeable, it is hilarious how much better they (the GEN1) look. Uh, but that is not why I am here!

So, my confusion stems from the fact that this particular GEN1 helmet, Security, looks like the Halo: Reach one. But Halo 3 is the older game, so if Reach’s Security is classified as GEN1, then what does that make Halo 3’s Security Helmet? GEN-1?

Seriously though, GEN1 is so much bette–

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