Originally Posted by
Aeellyce 
This is an interesting thread but I do feel we confuse a few terms and behaviors or perhaps we are talking about more diverse things.
Back in the mid-90's when I first became an EMT, I had an instructor that defined the difference between being aggressive and being assertive:
Aggressive - "My way or the highway, no matter what"
Assertive- Being able to quickly act/perform with confidence.