Well, this is the classic, generic ending for many a video game: enemy is defeated, enemy stronghold explodes with dramatic flair, victorious troops celebrate and prepare to go home.  Hmmmm, it appears as if the Guicy have built an exact replica of the lunar Base Nectaris on the planet Mars (so you don't actually have the satisfaction of seeing the original Base Nectaris blow up...just the replica).  The Union army (whose uniforms and weapons are a fierce lavender color) briefly celebrates its victory on Mars before the space armada heads back home to Earth.

A variation of the final image (Earth as seen from a lunar perspective) is found in all Nectaris games. That's it.