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This is not about Marine units being effective or not but more about the fact that they are not so much more effective to warrant their use as a stand-alone service branch, specifically in the future of Robotech warfare.
Ok first of all Ill point out that if the RDF had a wet Navy, Army, Air Force and Spacy branch in 2009 then there would have been a Marine branch too. This Marine element would be tasked with defending the interior of ships (to include nuclear ordinance), and spacecraft as well as securing beach heads. Also the RDF/UEG in preparing for a possible alien invasion would want a Naval Infantry force capable of landing anywhere from the seas using the Daedalus class submersible landing ships. Now would the UEG simply use the term Naval Infantry or use the term Marines for this force?
I should also point out that a single Daedalus class submersible landing ship is capable of deploying an entire Marine Expeditionary Brigade (MEB), to include VTOL and STOVL air assets, with the fixed wing air assets of the MEB being based on the Prometheus class submersible carrier that would accompany the Daedalus class ship.
Now after the Rain of Death its likely the only coherent infantry/mecha combat units would have been on the MEBs on board the Daedalus class submersible landing ships. Yes there would have been Army and Air Force units that survived the Rain of Death, but their bases would be in shambles, and it is also likely military command centers were targeted during the initial bombardment.
We know humanity rebuilds/recovers from the Rain of Death, and that the Army of the Southern Cross is formed. The ASC would have most likely been built up from the ashes of the RDF/UEG Army, RDF/UEG Air Force, and possibly Privatized Military Corporations.
Nevertheless the RDF/UEG Spacy and RDF/UEG Navy would have still retained their RDF/UEG Marines, and after the role they would have played after the Rain of Death I doubt the UEG would simply absorb the RDF/UEG Marines into the RDF/UEG Army. Thus there would be a EF/UEG Marine branch in the latter years of Robotech.



