Government and private sector entities rely on satellites for services such as communication, navigation, remote sensing, imaging, and weather and meteorological support. Although the government owns satellites, it also relies for certain services on satellites owned and operated by commercial satellite service providers. For example, the Department of Defense (DOD) typically relies on commercial satellites to fulfill its communications and information transmission requirements for non-mission-critical data and to augment its military satellite capabilities. The commercial satellite industry is also a critical component of the worldwide and national economy: the industry generated $85 billion in revenue in 2000. Accordingly, disruption of satellite services, whether intentional or not, can have a major adverse economic impact. Satellites are vulnerable to various threats.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.