Rod,
Not sure if this will work but try it.
Specifying an icon on an operation only works using
an icon image or a class. Icon font does not work.
Using icon class.....
The default for edit is for example aw-icon-edit.
So create two icon classes in aware-ext.css called
.rocket-launch-yes and .rocket-launch-No
In the icon class of the attribute you enter
rocket-launch-<<BO.RocketLaunched>>
You might need to enter as...
rocket-launch-{RocketLaunched}
I am not near computer so can't test. May not work
At all but that is what I would try