No EFI Boot option from Boot Camp-created Windows 7 USB drive?

I can't get an EFI boot option from my Win7 USB thumb drive. Previously I had been running Mavericks, and with that I was able to select either the BIOS option of the installer ("Windows" under the ALT screen) OR "EFI Boot", but now I'm only getting the bios install option.
Does anyone know the trick to installing Windows with UEFI on my late 2013 rMBP?

I have W8.1 installed under EFI on a late 2013 rMBP. Can you check your USB drive? Is it a USB2 drive?
The structure should similar to the following, and you can see the EFI files. You can try an SMC reset - Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support and check if it changes the behavior.

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