The German military is a joke, they are poorly equipped and poorly trained. They basically have a token force and rely on the US to defend them as well as pick up the bill for it.
Now the US is cutting back, Germany is getting worried that they might actually have to pay for their own defense. So want to offload the costs on to the rest of the EU instead. Sure France seem enthusiastic now, but they won't be taken for mugs for long.
And why is that? Can you think of any historical reason why Germany might not have spent a great deal of money on it's military over the last few decades? Some event, perhaps, that might have make such a move... unpopular.