In urban air ozone is a component of smog, which damages lungs.

FORBES: The Ozone Solution

The Israeli airline, El Al, has famously depended on having undercover air marshals on their flights as one component of its successful deterrent strategy.

CNN: Blame game won't stop terrorism

Now, of course, Patriot missiles are a key component of the U.S. air defense.

CNN: Weaver: Creature comforts scarce, but soldiers get their mail

Conversely, a Northeast Asia MRC force could be tilted in favor of additional air and sea units with a smaller ground combat component in recognition of the capabilities of the South Korean army.

CENTERFORSECURITYPOLICY: Section IV: Building a Two-MRC Force for the 21st Century

Its critical component is an ingenious device that can cool the incoming air almost instantaneously.

BBC: Skylon: A British dream of space

Although the number of F-22 fighters was capped at 187, the Air Force would increase its long-range strike capabilities by 50 percent and the penetrating component of long-range strike by a factor of five by 2025.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2