The NY Post discusses how America needs to fight back on multiple fronts if it intends to beat China in the cyber warfare game:

The way to do this is for the Obama administration to convince our adversaries that the expected benefits from successful cyber-attacks would be dwarfed by the price paid for conducting them. That doesn’t only include hitting back with our own cyber-attacks.

The White House has already introduced a sanctions program targeting those who conduct cyber-attacks against the United States. President Obama should go further.
The administration should also comb through the long list of collaborative programs with China and defund those that can be seen to benefit the Chinese more than US interests.

Furthermore, forging strong collaborative ties in cyber-defense with key partners and allies, such as Japan, would send Beijing and other adversaries a strong message about ending the Wild West era of digital attacks. We already have traditional defense agreements with allies; it’s time to beef up our cyber-alliances too.

The OPM hack should not be seen as an isolated, one-off case, but as the tip of an iceberg, one piece of a larger ongoing Chinese campaign in cyberspace against the United States and its interests.

It is a persistent, multi-pronged and low-intensity campaign, which does not aim at simple “shock and awe.”

The campaign’s long-term goal is to improve China’s strategic standing vis-a-vis the United States without — and this is the key — provoking a military response.
The Chinese and their collaborators hope to compromise America’s core intelligence capabilities and erode the source of US global power: its economic dominance.

Is America capable of adapting its warfare doctrine and traditions to fight a war in cyber space? The verdict is not yet out on this but I suspect there is a lot of US military cyber activity taking place that we rarely ever hear about.