Aircraft engineering for aerial refueling; product development for aerial refueling, and product development consulting services in the fields of aircraft refueling, aerial refueling training systems, aerial refueling tankers, fuel systems, safety systems, intelligence, surveillance, and reconnaissance systems, low cost attritable aircraft systems, unmanned strike fighter systems, autonomous systems, power and energy logistics systems, airborne network systems, in situ intelligence processing systems, artificial intelligence and machine learning computer systems; defense consulting services in the nature of consulting services pertaining to research and technology in the field of Aircraft engineering for aerial refueling; product development for aerial refueling, and product development consulting services in the fields of aircraft refueling, aerial refueling training systems, aerial refueling tankers, fuel systems, safety systems, intelligence, surveillance, and reconnaissance systems, low cost attritable aircraft systems, unmanned strike fighter systems, autonomous systems, power and energy logistics systems, airborne network systems, in situ intelligence processing systems, artificial intelligence and machine learning computer systems