SoylentBlue
*narrows eyes*
Alright. Constructive Criticism firing away.
While there is a generally Gundam-like feel to the story idea, there's a lot of things that I don't think work very well together:
-First off, why is it called Gundam HALO? Generally, Gundam shows are named after something highly relevant to the series (for instance, Gundam Z had the Zeta Gundam as its main 'hero mech'.) Your synopsis said nothing about why it was called Gundam HALO... if there is a proper reason, it'd be interesting to hear. If there is no reason, it might work better if you chose a name that had to do with something in the story.
-012 Tyrannical Era sounds like a really weird Era name, seeing as the people who name the Calendar initials (in this case, TE for Tyrannical Era) wouldn't be calling themselves tyrants.
-What is the organizational name of said fascists? You know, like Zeon or ZAFT in the other shows... not as if those were necessarily fascist themselves... but your 'evil' government still needs a name.
-Why was the colony plan in vain? Did the 'fascists' lead hostile takeovers on the colonies? Were the colonies destroyed by the fascists during construction? Was the funding for the colonies seized by the fascists? There needs to be what and why applied here.
-How powerful are Gundams (or in this case, GUNDAMs) in comparison to standard Mobile Suits? More powerful? Far more powerful? Cosmetic differences only? This also ties into the next point...
-Why is Jasper only a 2nd Lieutenant and yet he is allowed to pilot the AGNUS GUNDAM? Is he incredibly gifted? Is the AGNUS GUNDAM coded only to respond to his commands? Was there the classic 'young man accidentally gets into Prototype MS and beats the bejesus out of opposing forces' kind of scene? Or maybe...
- ...Is Jasper something of a 'new breed' of human or soldier? Does such a concept exist in the story? By 'new breed' I mean things such as Newtypes or SEED Bearers.
-What's the tech specifications of the Colonies and the fascists. What are their Mass-produced suits? What are their Prototype Suits? Do they have any secret military projects in development?
That's all I can think of for now, of the largest gaps in your story synopsis. If you take all those in mind, I'm sure you'll have at least a decent start to making your own Gundam storyline.