No USB Device in web client?

I connected to an ESXi 5.1 Server from the standard vSphere Client.

I created a vCenter 5.1 VM.  At the top of the Windows VM on the vSphere client, there are small icons to connect a CD/DVD, Floppy, and USB.  I can connect my PCs local USB drive to the VM and move files.

I installed the required 5.1 applications and installed the web client.

However, when I log on to the vCenter Server from the web client, I cannot connect my PCs local USB drive to the VM.

The only options I see in the web client hardware screen are CD/DVD and Floppy.

Under VM settings, there is no USB Client.

Is it possible to connect a local USB drive on a PC to a VM under the 5.1 web client?

thanks