I never read or seen any Kerberos manga or TV shows but I know that the Helghast Assault Infantry aesthetics are almost the same as the Protect Gear in Kerberos,I do believe someone in GG must have seen the Protect Gear during KZ1's development.
Personally, I like Colonel Mael Radec, the guy has a fancy ass uniform badass.. A tactical genious, yet he commited suicide without giving the pleasure to the enemy to kill him or to hold him as prisoner. The guy is fucking awesome.
The Elite Soldiers should have been named differently, like for certain projects like the Killzone games themselves: “Elite Commando” or “Shock Commando” or both separately so that way the game alongside other subjects in the series wouldn’t be so cliche-ish.
As I've already stated, the Helghast aren't the only "Space Nazis" in fiction. There's the Zeon factions from the Gundam Universal Century continuity, the Neosapien Order from Exo-Squad, the United Powers League/United Earth Directorate from StarCraft, the Star Wars Galactic Empire, and apparently the Cerberus terrorists from Mass Effect. Of course there other Nazi-like groups that are more Earthbound, but I'm a little curious on what other enticing Space Nazi factions are out there. Thoughts on what's good?