Mr. Brainheart wrote...
These are good suggestions Rudy, it'd certainly add some necessary variation. I like the idea of a dossier on Ash, maybe that could be used as 'the external view' of Ash, what others think of her, how she's doing, etc..
Dossier and "journal of unit activity" (damn it, anyone served in your western army, how you call it?) allow you to "distance" yourself from description, thus removing "fanly attitude", yet add that "background" usually lacking. Also it helps to fill timeline. Speaking of which.
First, let's draw a bit.
Since you good at that, I suggest you to be responsible for that.

_____-1_________0________________1__________________2__________
And so on. This is our timeline, Primitive, I know

, but let's fill it with what we know. Point zero - is obvious, that's our reference point, Ash birthday. On the right will be events from her life - school, sisters birth, her school and career path. On the left - events before Ash was born, for example how her parents met.
So far we only need to place tick marks on evens "below zero" - just to mark their existence. Same, btw will go on the right part of the line.
For the first stage, this line has no scale - we just place events, nothing more.
On second stage, we choose yearly scale, i.e. each tick mark for each year of her life.
Third, and so far final stage - monthly scale. Since they didn't provide us with space flight time-events scale (i.e. flight from Eden prime to Citadel - 12 hours, time on Citadel - 4 days, flight to Artemis Tau and search for Liara - three weeks, etc), more precise scale is irrelevant, but I think we will be able to narrow certain events to month.

For the beginning we place only events we know, those will be "concrete", immovable tick marks, "happens always", regardless of our (i.e. player) choices - no matter what happened in our "head kanone", those events should be taken from game. Then we find gaps between those events and decide how to fill them, for example Ash life after conscription, her time in boot camp (three months, for example), first unit, second training, etc, filling her career path and way up on ranks. This will require either full listing of her dialogues from games, if this is possible, or nerdy replays and print-screening (since ME1-2 available in Steam it's not that problematic).
After we basically fill the gaps, then we can begin sketching (relax Mr. Brainheart, no drawing this time

), for example Ash arrival at 212 (btw, what's that - 2nd Section, 1st Platoon, 2nd Company, or 2nd Platoon, 1st Company, 2nd Batallion?), impression she made at her CO and fellow soldiers, impression she had from them (I guess our CptData can take that and cover it in form of mails home or hidden diary (preferably given in form of hand-written-alike font). Don't forget about censorship - certain parts of her mails should be censored, but there is could be a "first person view" from Censor eyes, who actually editing her mails, if we really want that, I guess we can by Garrymod or whatever and experiment with it, if it's possible to extract ME1 models (yes, ME1). Or Mr. Brainheart probably will be able to draw something like that.

CptData wrote...
@ Rudy: why no Diaries? I like my series 
I'm not sure for Bundeswehr regulations, but those regs I saw were opposite to diary in any form. "Security reasons". Since Ash is Aries and thus - could be stubborn (Aries anyone?) and somewhat rebellous so theoretically she could hide her personal "pen and paper" pocket-size notebook. Not sure for scanning equipment and checkouts, probably it will be targeted only on electronic notes, not paper ones.
but somehow I think her early days diary (a.k.a. before Shepard's death) actually shouldn't exist - I guess she is "lawful neutral" character, so if there are orders, you'd better shut up and follow them.