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But Pioneers are way too specialized to be used with anything but marines unless you're in South America otherwise their only purpose is to increase the naval invasion bonuses of your marines.
Pioneers replace Engineers.
So you can use both eventually.
Rangers should take Rough Terrain -> Mountain Artillery -> Backbone of Forces. The Cold Weather specialisation isn't really that useful compared to Mountains, which are more common terrain.
South America and Asia there's an argument to make to use mixed Mountain/Marine units, instead of all Marine/Mountain. If that's the case, you would take Jungle Specialists for the Marine Pioneers, and the mixed units (say, 5 Marine, 5 Mountain) with Pioneers & Rangers as that unit will be better at fighting through the jungles, mountains and rivers common in SA & Asia.
Majors using Marines are likely going to focus on Marines ONLY doing naval invasions for the Pacific or DDAY in Europe or Japan. So you take Pioneer Shore Parties -> Expeditionary Units, Blowtoch, Task Forces. Marine Commandos are micro heavy and fiddly so avoid that path unless you have Man The Guns AND are going to use Amtracs & Amphib Armour. for heavy mechanised marine units.
Backbone of the armed forces is, in most situations, inferior. It gives 10% SA to mountaineers vs shared instructors 10% attack of all types to all special forces. And, unless your army is quite small, instructors will give more special forces than backbone will.