Woah that's alot to unpack, I'll give it a go anyway
1. Veterancy based on kills and duration of combat would only be relevant if their was a healing system non-gold feature in-place. If your prized unit gets wounded you'll have to let them wander around your country for a couple days before they can even go back into the fights. As for having experience for exisiting longer, I don't think doing drills over and over warrants a distinguished buff.
2. Moral affecting quality of troops sounds interesting but forces players to their core and might get messy around day change.
3. This feature seems to ignore the fact you research better troops, that equips the next generation with better gear and tactics rather than training individual units.
4. Paratroopers compared to the rest of the army, are small in numbers and lightly equipped. Moving units to the front in cargo planes, would move not just men, but all their supplies and support weapons. If you're looking to create a fast road to the front invest in an infrastructure road.
In summary, I SMELL GOLD.
