Reboot Continuity and Naming Conventions
In "rebooting" the Robotech storyline, Harmony Gold has apparently opted to abandon the traditional notion of rivalry between the Robotech Defense Force (RDF) and the Army of the Southern Cross in favor of a "United Earth Forces" (UEF) model. As a result, abbreviations have changed; for instance, in Palladium Books' Robotech: The Shadow Chronicles RPG, references that would formerly have been made to the RDF or Robotech Expeditional Force (REF) are now made to the UEDF or UEEF.
Preferences for specific names aside, one potential problem associated with this realignment is that the Army of the Southern Cross makes sense only if it came into existence as a rival to whatever we're going to call the military structure that reconstituted itself on Earth after the Zentraedi bombardment of the planet. The reason is that to create an entire military structure, with its own ranks, traditions, uniforms, etc. simply is not worthwhile; if there were no rivalry, then the Expeditionary Force would have just been a fleet affiliated with the Earth-based Defense Force.