Trying to go wireless...but wait a second, D1 is already installed!! (no replies)

I ordered some diodes to solder across D1 to kill my USB connection. I already have Bluetooth set up and working so I would really like to just have RAMPS be powered by the PSU. I finally got them and went to solder it in, but D1 WAS ALREADY INSTALLED.

So what do I do? Is there a firmware setting I'm missing? I'm using Marlin.

Thanks.