I always thought this first theme (from 00:00 to 1:44) captures pretty well the situation the AEUG lived in the Gryps Conflict. Being rebels from the current status quo of the Federation, in inferiority of resources in general, dealing with all the tragedies that happen & despair around them and fighting with their hopes in the better tomorrow that Quattro wants to bring to both the Earth and humanity; towards that bitter end, despite actually defeating their main foes in the conflict.