Joint doctrine for engineer operations is built upon, and consistent with, the principles of joint operations described in Joint Publication (JP) 1, Doctrine for the Armed Forces of the United States, and JP 3-0, Joint Operations. Engineer operations enhance the ability of the JFC to successfully apply these principles to joint operations. Major operations and campaigns frequently require ground combat (or the possibility of ground combat), as do crisis response and contingency operations. Such operations will require engineers who can integrate their activities with the fires and maneuver of ground combat forces to assure the mobility of friendly forces, alter the mobility of adversaries, and enhance the protection of friendly forces. Some activities require engineer capabilities as an inherent part of a mission to provide support outside the joint force. Engineer support is inherent in the tasks of stability operations to restore or provide essential services, such as water, power, and transportation, and to repair critical infrastructure.