Nathan Poole, chief operations instructor for the Common Aviation Command Control System Phase I, shows Lance Cpl. Ethan Weaver, an air control electronics operator, Marine Air Control Squadron 24, how to navigate a portion of the Common Aviation Command Control System (CAC2S). The MACS-24 Marines received in depth training on the new system as a part of Phase I of the CAC2S program. - Nathan Poole, chief operations instructor for the Common Aviation Command Control System Phase I, shows Lance Cpl. Ethan Weaver, an air control electronics operator, Marine Air Control Squadron 24, how to navigate a portion of the Common Aviation Command Control System (CAC2S). The MACS-24 Marines received in depth training on the new system as a part of Phase I of the CAC2S program.