I like your thoughts on some of the troopers we see in Rogue One and Solo actually being under the auspices of the ISB. That makes some sense to me, also given the overall look of the designs. I suppose the Juggernaut drivers in Mando would be as well?
Everything in that felt like a clandestine Imperial facility. Tracking it down, the Shore Troopers, the Juggernaut drivers' helmets, and the officer Mayfield shot was talking about the sort of stuff ISB officers would do in the EU. Sorta like Imperial Commissars in Warhammer 40K -- sacrifice as many troops as necessary to achieve the political goal. And then heap honors on them afterward, of course.
I always kinda felt like many of the trooper names were just sobriquets and not actually meant to be what they were literally called within the Empire. Sandtroopers are just stormtroopers with frontier gear for those far flung posts. Of course we only saw them on Tatooine, a sandy planet so the assumption is, oh they are clearly desert combat stormtroopers (aka: sandtroopers). I'm not certain that was necessarily the early intent. My thoughts on snowtroopers being generally the same.
Sandtroopers were just Stormtroopers in kit for extended ops in hot deserts. Enhanced cooling gear, less close-in sensor capability, equipment for being out where there's nothing but sand... It wasn't an Imperial-held world, so they weren't local troops, and Vader told Praji to see to the search for the plans on the surface personally. It was a detachment sent down from the
Devastator.
As for Snowtroopers... I have had mixed feeling about them since Solo. Originally, they were developed out of the concept that became Boba Fett -- a company of elite Imperial commandos tracking Our Heroes. We've just always assumed they're Stormtroopers. For me, the big tell is the helmet. In the OT, if it has a Stormtrooper faceplate, it's a Stormtrooper. In ANH, we saw Stormtrooper pilots. In Empire, we saw Stormtrooper armored-vehicle operators. I'll get to that lower down. But the Snowtroopers have the same helmets and armor as Veers, just with a closed in face. Now we have the Imperial Army troopers in Solo with the same armor and helmets again, including breathers and goggles for varying battlefield conditions. Since the "supertroopers" that were originally going to be Mandalorian commandos evolved into the Snowtroopers, and they were supposed to be "better" than the Stormtroopers we'd seen in the first film, are they necessarily Stormtroopers? It would mean jettisoning everything all the way back to Kenner's "Stormtrooper (Hoth Battle Gear)" action figure. But it might fit better that those are Imperial Army troops in cold-weather gear.
But there's so much built on them being Stormtroopers, including the retroactive continuity of the cold-weather gear the clone troopers wore in Clone Wars, that I may have to just accept them as Stormtroopers, and their hostile-climate armor just inspired the Imperial Army's combat gear after the Clone Wars ended.
In the context of the movies, we're left to assume that stormtroopers (and their many variants) are the rank and file soldiers and I just don't think that was necessarily the original intent. In almost every instance in the OT, we see stormtroopers because they are usually either attached to Vader or affiliated with the Death Stars, where elite troops would make sense. Sadly, in the following decades, no one changed that perception with the possible exception of the "regular" Imperial soldiers depicted on Mimban in Solo.
See, to me, the Stormtroopers were always the Marines. We see them in boarding actions, taking beachheads, guarding military facilities, and serving as embarked troops aboard the Imperial Starfleet's vessels. And, like the Marines, they have their own pilots and armored-vehicle drivers and snipers. It was apparent to me that Veers and the AT-ST crew in ROTJ weren't Stormtroopers, but were part of some parallel organization, from the matching helmets and goggles.
Since then, I've had a lot of time to look at the visual and subliminal storytelling of Star Wars and Empire. In the credits for the first film, we have General Tagge and General Motti. Army/Marine ranks. In Empire, we have General Veers (Army/Marine again), but Captains (which can be both Army and Navy, but here it seems to only be applied to capital-ship commanders) and Admirals, too, all wearing the same uniform. So I realized the Imperial Starfleet was a combined service. Which makes sense -- ships alone can't take and hold territory, and troops are useless if you can't get them to the planet they're supposed to fight on. I decided the single-line rank insignia in Star Wars was the Army/Marine type, and the matched red-over-blue of Empire was the Navy version, and Stormtroopers and their Generals wear whichever version is appropriate to where they're posted, so the personnel around them know at a glance where they fit in the hierarchy.
I rejected the EU's assertion that the black-uniformed people with the
kabuto helmets were Imperial Navy troopers, same as I reject the Rebels with the white
kabuto helmets are "Rebel Fleet Troopers". It clashes with the way things are presented in the OT. We constantly see Stormtroopers being accompanied or ordered around by people in black uniforms. A guy in a black uniform is told to see to the search for the
Death Star plans on Tatooine personally, and then we see a bunch of Stormtroopers. Stormtrooper pilots wear identical black jumpsuits to the
kabuto-helmet-wearing "Navy Troopers". Scout Troopers also wear black jumpsuits (albeit slightly different ones). So my takeaway is that all the black uniforms are Stormtroopers, in garrison uniform versus combat gear. Further backed up, I'm willing to bet unintentionally, by the EU giving us Shadow Troopers. The only glimpses we got of "Army" uniforms were Veers and the AT-ST crew, until Solo. That is one thing I praise that movie for above all else. Beckett's stolen uniform (I would still have preferred he was a veteran officer who didn't like the way the Empire was shaping up and decided to desert), all the "Mud Troopers" -- we finally saw the poor, bloody infantry.
I just feel like "plain jane" stormtroopers should've been more universal in nature, without the endless variations for every possible contingency. ie: Coral Reef troopers for combat around coral reefs, River troopers for combat around rivers. Sidewalk troopers for combat on sidewalks, etc etc. Lol! Hyperbole but that's what it feels like sometimes. Of course, I'm probably wrong in my meanderings on all this but in my mind it makes more sense.
To brush off my military quartermaster doublespeak...
• Armor, Combat, Stormtrooper, Standard, Variable Battlefield
• Armor, Vehicle, Stormtrooper, Standard, Light, Starfighter
• Armor, Vehicle, Stormtrooper, Standard, Light, Armored-Vehicle
• Armor, Field, Stormtrooper, Force Reconnaissance, Standard, Light
• Armor, Garrison, Stormtrooper, Standard, Light, Gunnery
• Armor, Combat, Stormtrooper, Extreme Environment, Arid, Hot
• Armor, Combat, Stormtrooper, Extreme Environment, Arid, Cold
• Armor, Combat, Stormtrooper, Extreme Environment, Radiation Zone
• Armor, Combat, Stormtrooper, Extreme Environment, Reducing, Volcanic
• Armor, Combat, Stormtrooper, Extreme Environment, Reducing, Corrosive
• Armor, Combat, Stormtrooper, Specialized Terrain, Aquatic
• [N.B. For "Armor, Combat, Stormtrooper, Specialized Environment, Zero-Gravity Operations", see: "Vehicle, Spacecraft, Single-Occupant, Exo-Suit, Stormtrooper"]
• Armor, Special-Operations, Stormtrooper, Veteran
• Armor, Special-Operations, Stormtrooper, Veteran, Advanced
• Armor, Special-Operations, Stormtrooper, Force Reconnaissance, Veteran
• Armor, Special-Operations, Stormtrooper, Light, Starfighter, Veteran
It seems like a lot until you realize there are four foundation layers in varying degrees of uprate, four types of armor in varying degrees of uprate, and six helmets in varying loadout and degrees of uprate -- and two of those use the same faceplate (and associated internal componentry), even. There are a couple more if you factor in the "Deltas" that are the Imperial/Storm Commandos, but they're semi-separate from the rest of the Corps. And I'm not counting the Snowtroopers for the moment, as I'm feeling very Heisenbergian at the moment about where they fit in...