Why does admin.jar -deploy always prepend an underscore?

[Roger Vaughn]

I have noticed that when I use the admin.jar -deploy command to deploy
my applications (which is required to deploy remotely), Orion deploys
the application using its name the first time, but appends one
underscore for every redeployment afterwards.  I need to be able to
deploy my application replacing the previous instance - using the
original, unchanged name in other words.

I haven't found any command-line options that allow this.  Is there a
way I can do this?

Thanks,

roger