From the AP, via Newsday:
Defense Secretary Donald H. Rumsfeld is hoping China will reveal more about a massive military that the Bush administration sees as a potential near-term threat to U.S. interests in Asia and a possible global rival in the future.
Rumsfeld departs Monday on his first trip to China as defense secretary, marking a new opening to the country. China's military, with about 2.5 million people under arms, is the largest in the world, and Rumsfeld wants Beijing to detail more about the scope of its budget and the intentions of its leaders.
See also "Rumsfeld to Make Official Visit to Beijing" from the Washington Post.