Spaceflight 101's Orion Spacecraft Overview shows the following tests for the escape system.
Why are there eight ACS thrusters arranged octagonally? Is it just to reduce cosine losses or does this allow for better, or perhaps easier control?
Update: I've just seen something similar, with a four and eight configuration of pulsed thrust for very rapid response. This is a screen shot of a video about India's Shakti ASAT kill vehicle.