China and Russia have launched major campaigns to contest the American presence in the global commons. These initiatives include challenging US surveillance operations in international waters, trying to constrain American military access to outer space, and enhancing their capacity to disrupt US use of the Internet. Overcoming Chinese and Russian anti-access efforts are essential for preserving the security of the USA and its allies. In particular, as the US military has reduced its forward bases in Japan, South Korea, and other Asia-Pacific countries, it has become increasingly dependent on the global commons to rapidly deploy forces based in the USA to potential conflict regions. A failure to overcome anti-access threats could lead Asia-Pacific countries to call into question US security guarantees.