The Assassins and Grunts were allies before Gearbox made and released the expansions for Half-Life 1, for the new folks around 2020 or something who never knew. I've always had this thought at the back of my mind "not-really-asking": "Wait, weren't the grunts and assassins considered allies to each other before Gearbox made the expansions?" So in "Pre-Expansion" Era; Assassins are considered a part of the HECU before Opposing Force turned them into the now-known Black Ops. edit: forgot to mention yeah that's one shitty picture to show evidence they were chill with each other
(Edited)
The military did not exist as the HECU until Opposing Force, before that they were just "military". Assassins were almost cut but added later in the game because they were near complete but just needed some things to make them work in the game. Both monster_human_grunt and monster_human_assassin are classified as CLASS_HUMAN_MILITARY but this is simply code and not indicative of anything. In game they are never seen together, so their affiliation is left ambiguous. It's quite possible they worked together in some form before the HECU mostly evacuated before the ones left behind became greenlit as targets for Black Ops along with BMRF personnel.
oh dw i didn't really mean to... i guess ""undermine"", what ever the word is called to disprove of something really now, it's sorta the opposite like a unnecessary detail being said that isn't in the game normally like how Grayfruit does from his old HL1 stream it's cool to point out, but it's comically yet sort-of interesting unnecessary detail to inform lol