Huge Halo Fan Here
You got quite a few things wrong...speaking as a total Halo nerd. :D
The human version of the tank is called the Scorpion. Miranda Keyes is spelled with an "i", not an "e". The Chief doesn't wake up in a cryo tube at the beginning of Halo 2, that's at the beginning of Halo: Combat Evolved. 343 Guilty Spark is only one of the two monitors we meet in the Halo trilogy, the other being 2401 Penitent Tangent. Also, I wouldn't technically call the ending of Halo 3 a success for the Master Chief, as he is left drifting in space while he waits for rescue.
God I am such a fucking nerd. One other tip: Learn to make proper buttons, there are dozens of free tutorials online and this is one of the first things I notice when viewing Flash movies.
In short: This is a good idea, but it needs a lot of work to be truly great.