Also, the worlds of the so-called Chaos March is useful for planets that often fluctuate between ownership among the various houses. I just think an AFFS officer of Japanese descent is highly unlikely to happen; Hanse Davion used Justin Xiang Allard's Chinese ancestry to justify his cover story of being court martialed out of the AFFS in order to have him infiltrate the Capellan Confederation. His father was from the Fedsuns, but his mother was Liao noble.

So it's sensitive territory. I would have said, "Do Caph" for your character as there's more wiggle room on heritage, but I did Caph for some very specific reasons that become clear later in the RP. You might want to consider a Chaos Marcher anyway.