Rumsfeld's actual quote
From your very own link to the transcript thank you very much.
Since the Iraq conflict began, the Army has been pressing ahead to produce the armor necessary at a rate that they believe – it’s a greatly expanded rate from what existed previously, but a rate that they believe is the rate that is all that can be accomplished at this moment.
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And it’s essentially a matter of physics. It isn’t a matter of money. It isn’t a matter on the part of the Army of desire. It’s a matter of production and capability of doing it.
Whitcomb: it is a matter of the logistics of being able to produce it