sentences:  Unlike the more senior courses at Air University (e.g., Air Command and Staff College and Air War College), "in residence" attendance at SOS does not include any U.S. officers from sister services, although those officers are eligible to take SOS via correspondence or distance learning formats.Eligible senior members of the Civil Air Patrol (CAP), the civilian U.S. Air Force Auxiliary, who hold the rank of captain or above are entitled to attend SOS.The curriculum is accessed by CAP student officers through the SOS distance learning platform.