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Aug 18, 2015 1:42 AM in response to rojw13by mende1,Welcome to Apple Support Communities
It looks like Boot Camp Assistant cannot change boot order to your USB drive somehow, so try doing it manually.
Plug your USB drive with the Windows installer and the Boot Camp drivers, restart your Mac and hold down the Alt key while your Mac is starting up until you see all bootable devices on the screen. Then, choose the option labelled as "Windows" with the USB icon, and the Windows installer will load up. Finally, you can follow these steps from step 4 -> How to install Windows using Boot Camp - Apple Support