Description says melee unit. But also Range: 1. with a ranged strength of 65 it's better than the musketman. +20 makes them rival tanks in attack. Not a good defender though.
The +20 is to combat strength, not ranged combat. (So it makes them defensive)
Having rangers upgrade to some kind of paratrooper (commando a good name maybe?) would work. I'd be very surprised if there was no marine or paratrooper unit shipped with the game. Yes, I know amphibious attacks are a promotion, but they were in Civ4 and Civ5 too yet they had a marine unit. I dont see a commando as an absolute necessity though.
You were right about grenades being a siege weapon, but grenadiers were for a long time (still in some places) a more general term for elite, shock infantry. Considering such a unit would also heavily be used to attack cities in civ, I think the name makes sense for a civ 17th century heavy melee unit. I think messing around with 'unusual' bonuses for non unique units at this point is premature. In general I'd rather have minimal changes to the structure and balance of the game, unless you can argue this is a critical one
You're also right about Fusiliers, it's a great name. Specially as I'd rather keep 'Line Infantry' as a generic name for the whole upgrade line
As for the rest, I feel like it's mostly trying too hard to force the game down a path it isn't made to go. Again, small tweaks are better than abolishing entire upgrade lines.
The generic term is Special Operations for the SEAL, Delta Force, SAS, Commando, Special Forces. Although Delta Force and SAS are really specific units, while the rest are more generic terms.
Spetsnaz is actually a misunderstood term, it simply means special purpose, which doesn't specifically need to be special ops. There are many different Russian units with that moniker.
Since WWII, the term has, I think, become generally recognized as the descriptive, if general, term for the Russian Special Operations units.
No. I'm afraid that in Russia the term is used by any unit that doesn't fit the generic regular role, like some recon, sapper, etc. I've been scolded many times by Russian soldiers for using he term Spetsnaz as an equivalent of Western Spec Ops units. Russian Spec Ops are called literally 'Special Operations' Силы специальных операций Вооружённых Сил Российской Федерации
Use Google or any translator for this page: http://encyclopedia.mil.ru/encyclopedia/dictionary/details_rvsn.htm?id=14234@morfDictionary
Due to a project, these last two years I've been working closer to many active military in different armed forces (mainly from US, Russia and UK). I can assure you that Spec Ops is the generic term world-wide for the units specialised in irregular warfare.
Spec ops command or forces is simply the way certain units are organized. For instance the top Spec Ops command in the US is USSOCOM, that is divided in smaller commands for the diff branches, like the MARSOC for the Marine Raider Units.