Nevermind the dropping part, that's not so important.
The problem is that commandos and rangers are useless without smgs and unlike airborne or fallshirmjägers they don't have access to weapons like G43 or lmgs. So I think it would make sense if they were 5 pop but then the smg upgrade increased the pop by 1.
Gah.. In reference to the commandos part of that comment, i'm sure somewhere cloud234 is having a heart attack at the thought of someone saying vanilla commandos are useless.
I also never said that 5 pop AB or Rangers should have upgrades either. Purely benefitting from doctrine buffs makes them overpowered for their pop. 5 pop for smoke/fireup or any form of suppression breaker is just a bad idea in my opinion.
Also, Infantry Support for Infantry company might be what you're after. Riflemen have access to grease guns, zooks and smoke grenades as well as BAR's, grenades and sticky bombs. Allows for incredibly versatile infantry gameplay, not to mention it's a hell of a lot of fun!