Close Air Support (CAS) is the use of air power in close proximity to friendly forces against enemy combatants. CAS
requires precise and detailed communication between the personnel on the ground and the air vehicles. To be useful, a
network simulation should be a superposition on the planning simulations for these activities. In a CAS mission, all of
the above activities are critical. A hypothetical CAS mission is modeled as an "as is" solution with stove-piped
communications and a "to be" network enabled solution. A co-simulation laboratory using OPNET with SITL
(SYSTEM in the Loop, cosim, JFORCES (Joint Force Operational Readiness Combat Effectiveness Simulator), and
JSAF (Joint Semi-Automated Forces) simulation system is described.