WCF Metadata publishing for this service is currently disabled + Content Type error

Your code and config seems fine – except for one little point:

In your <service> tag, you have defined a name that doesn’t seem to correspond to the class that actually implements your service:

<service name="DestructionServices.Destro"  ......>
               ************************** 

but your class is:

namespace DestructionServices
{
    .....
    public class TacticalNukeSVC : INukeInterface
    {

Those names need to match! The name= attribute on the <service> tag in config must be exactly what your service class is called – fully qualified, including namespace – so in your case here, it should be:

<service name="DestructionServices.TacticalNukeSVC" ......>