I have a new WCF Service Application, when I hit F5 to debug, the WCF Test Client always comes up, but I would like to disable it since I am using soapUI to test instead.
I had a similar problem, and found this to be caused by the default Start Options under
> Solution Properties > Debug >Start Options >Command line arguemnts:
it was listing a command line argument of /client:"WcfTestClient.exe"
which was launching the test client. Simply removing this argument solved my problem.