the out of memory error was a fluke. I think the real issue is something to do with the audio drivers or the way that AMRA handles audio. I continued to get crashes all day. It only happens when i have the audio piped through the usb sound of my headset. if i pipe it through any other audio device then the game plays fine.

tried again for the same point in the game crash only this time I received an out of memory crash Crash image

I reinstalled the drivers and got further into the drawdown campaign. Until I reached the point where you take control of the UAV. the moment the UAV spun up the game crashed.