I can't boot any latest gen imacs off a mountain lion USB bootable drive

So I have created a mountain lion USB boot drive because I work on a number of imacs, but for the latest generation it doesn't seem to work.
I create it in the normal way, downloading the app through itunes then using http://liondiskmaker.com/ to create the usb boot drive.
When I try to boot from it: http://i.imgur.com/IUDlv.jpg
I get this icon on the screen: http://i.imgur.com/DNc8U.jpg
The weird thing is that I have used this exact bootable usb stick to upgrade many, many older imacs to mountain lion. I don't want to have to redownload the entire 5gb or so every time I need to install mountain lion on a new imac. I've tried this with both the 21.5" and the 27" varieties and both have the same issue. What is causing this?
I also need to boot from it directly rather then doing an in-OS upgrade in the odd times I'm working with an imac at a place that doesn't have a decent internet connection (6 gigs of downloading isn't available to everybody in Australia)
Someone has mentioned that it may be due to new imacs not allowing older installation media, but I have downloaded the latest version as of 3 days ago and it does the same thing.

It has nothing to do with Lion Disk Maker. That is only used to Create a Boot USB thumb drive, or DVD, of the Lion/Mt Lion install files. It does not add anything to either the DVD or thumb drive you create with it.
The problem lies with the Special build Apple creates for every new Mac that comes out that has different hardware then the previously released models.
Eventually they will come out with a new updated build, like 10.8.3, that will contain all the drivers for every Mac computer ML can be installed on, Older and the newest. Until that happens there is only one way to get a version that will boot on the newest systems. And that is to use either the Recovery HD or the Online Internet Recovery system ON one of those New Mac's. Those newer Mac's are the only one that can access the Special Build needed for the new systems.

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Message was edited by: Ben Yafai

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I can't boot any latest gen imacs off a mountain lion USB bootable drive

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