I guess courage is morally neutral if it is cancelled out by other immoral acts, but you are not arguing against objective morality instead you are arguing against the net effect of various objective morality measurements.

That's not an argument against courage but it could be an argument against other forms of objective morality such as murder and stealing and covetness.
I'm not sure about how you would define a serial killer as courageous.

No problem. The way I understand objective morality is as something to measure against. It seems like you are defining it as the way that someone must behave/act.
So objective morality is not situational but always present even though we frequently fail in our attempt to measure up to it.

I suggested that courage is an objective moral behavior. There is not a situation where courage is not the correct objective behavior. I think you are saying that if courage is an objective moral behavior then we would always act courageously but we don't so it's not objective. Is that how you are seeing it?

My apologies, Rob, this discussion deserves book length replies ;)
I am under the gun at the moment, so time is a challenge at the moment.

Can you name any examples of objective morality? Truly objective, to be followed in all instances, at all times by all people? Or is morality situational?

I don't see an either/or situation. You have free will to adhere to the objective morality or to not adhere to it. Objective morality is an external measure that tells us what we ought to do not what we have to do.

Even assuming objective morality exists, and that is knowable, should free will not remain?

I don't understand, why should we not be so compelled?

Yes, I think William Lane Craig argues for that, but I think it is an unsound argument.

We shouldn't be so compelled, in my view.

Why would be compelled to accept objective morality if it existed? What does accepting moral objectivity look like? Does it only mean adhering to it or could it mean an external measurement?
I'll try an example: it is objectively immoral to reward cowardice; so courage is objectively moral.