Katina is like Corneria's biggest military colony I think, and I think Bowman would need a larger fleet to take down Katina to win the war. And If Katina falls, Corneria is bound to be next, cause the only other planets Corneria has colonized are Aquas & Fichina(which sound very weak and open to attacks)
Of all the places in the Lylat system, this is the place I'd want to be stationed the least. It's a desert, there's not a lot of water and it always seems to catch the worst attacks of all the places. It gets swarmed by an Independence Day type flying saucer with all the little annoying fighters, it's the first base to get overrun with Apparoids, and it's only defended by Falco in command. Not exactly a nice vacation destination.