I like stories about Anna's past (as we know so little!). This story sort of reminded me of Chaz being "saved" by Alys at an early age and being encouraged to use his talents for good (in a good way, of course). That Anna was openly thankful for the opportunities presented to her was a nice touch.
The descriptions of the scanning equipment and the robots at the beginning were well done, as were Anna's reaction to them.
One thing didn't sit right with me, and I'm aware that I'm about to get onto my feminist soapbox.
In a series that has always had strong female characters (from Alis to Alys), I'm not sure if I'm buying that it's so "unusual" for women to join the military. Even in the same game, you have Amy becoming a doctor at a young age and the ruling entity of Algo being modeled after a woman. I can see them being skeptical over Anna's age and/or background, but it just doesn't seem to fit into Phantasy Star that women rarely went through the military training.