Can the Vampire, like the one in Halo Wars, go in space like the space banshee or the phantom? I've searched online but haven't come up with any info on if it can.
From the Halopedia article on it, it's described as an atmospheric anti-aircraft fighter. So I don't think it is generally used a space-based fighter. That being said, imagery of the vessel gives off the appearance of being air tight. So perhaps it could survive in vacuum, but it doesn't appear to be designed to operate efficiently in that environment.