Alien Grunt - Combine OverWiki, the original Half-Life wiki and Portal wiki
Martin Edlund - Combine Grunt (Half life Alyx Fan Art)
Here's a headcanon: All the HECU grunts apart from Adrian look like the original grunt model and Adrian is the only one with the high definition look. : r/HalfLife
Urby's 1999 Mercenary Grunts - Reimagined addon - Half-Life - Mod DB
Alien grunt - Half-Life video game - Hivehand - Alien monster profile - Writeups.org