Studying the UFO sets this one grew on me. But I still didn't like it. So I added some symmetry, decreased the number of antenna (I really didn't like the amount), and added some engines. It is a lead/command scout, for officers, with long range sensors and communication. They aren't always the best pilots that fly these saucers, but they are great strategists.
In this particular saucer is Rackis. I found the UFOs had names, except the blue one, so I named him. Though for the story there are multiple of each color, different names.
These were used greatly during their war with Blacktron, and then when they started to view the Exloriens as enemies because they were exploring a little too close to home. There's only one known command scout on Mars in the invasion.
Above we see all the current vessels. These are the only vessels in the beginning of the invasion, as they were only able to send smaller craft and pieces of craft. The fighters came in pieces after they gained a foothold. The scouts came first.