With ever increasing mobility of the work force and of the communication infrastructure itself, we will continue to see the growth in diversity of network domains and diversity of applications. The Global Information Grid (GIG) is a prime example of such a networking environment. In most networking scenarios, the component network domains are owned and operated by different organizations. This paper discusses how to deliver end-to-end service with requisite Quality of Service (QoS) to such networks so that overall mission goals are maximally achieved with minimal cost while allowing autonomous operations within each component network. In particular, this paper proposes a cooperative Service Level Agreements (SLA) approach and describes related SLA processes and roles.