CASS subsidiary Allied Defense Services International, Inc. (ADSI) has become a world-recognized name in air-to-air refueling training and operations. Our cadre of exceptionally-talented tanker instructors have built a proven schoolhouse system for tanker pilots and boom operators. CASS subsidiary CASS Professional Services Corp. (CPS) can provide unmatched consulting services in every aspect of civil and military transportation operations including flight and ground operations, logistics, legal & legislative, security, safety, communications and trade controls & licensing.