The airborne infantry is relay air assault, which is fine. but i feel you should also have true airborne. They have much longer range, but once they are landed they can only walk and cant fly again until they are at a city with an airbase.
the sea born assault mechanic i feel also needs a bit of tweaking. Realistically a beach assault tends to be fast and is a shock tactic. the landfall of marines should be much faster then 4 hours. Also if you look at modern beach assault tactics US Marines tend to use air assault. Marine expeditionary units will use their amphibious assault ship as platforms for osprey or CH-53 to air assault onto the beach or beyond it. So maybe have an amphibious assault ship that can carry something like 3 airborne (air assault) units.
the sea born assault mechanic i feel also needs a bit of tweaking. Realistically a beach assault tends to be fast and is a shock tactic. the landfall of marines should be much faster then 4 hours. Also if you look at modern beach assault tactics US Marines tend to use air assault. Marine expeditionary units will use their amphibious assault ship as platforms for osprey or CH-53 to air assault onto the beach or beyond it. So maybe have an amphibious assault ship that can carry something like 3 airborne (air assault) units.
18 Years US Army Infantry. experience ranging from door kicking to strategic level. 4 combat tours.