Those look like the older MacBook Air's without USB 3.0 support. Plus this was said to work on cMBP but not rMBP. However, something in me still believes it is possible to get Windows to boot from USB on a rMBP since the Windows install discs are converted to bootable USB drives by Boot Camp Assistant, so perhaps it does some funky magic with the Mac BIOS emulation to get it to work.I just prepared my USB 3.0 drive with help of this How-To:
http://social.technet.microsoft.com/wiki/contents/articles/6991.windows-to-go-step-by-step.aspx
Just need my ordered MacBook Pro to arrive, so I can test it...
This seems to work very well on a MacBook Air:
http://www.youtube.com/watch?v=7lUC4rtSfP4
http://www.youtube.com/watch?v=Zqv9Ybm5kP0
Has anyone tried converting a Windows installation to a DVD image and using the Boot Camp assistant to write it as a pretend install disc bootable USB drive? That might be something worth trying...