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Main navigation ABOUT C4i LAND INTELJOINT FORCES AIR PRODUCTS NEWS EVENTS Find out the latest announcements. About us Since 1989 C4i has led advancements in secure communications for the worlds most demanding missioncritical environments. C4is interoperable communications solutions are used by defence governments and industry in more than 40 countries. C4i products enable rapid response times interoperability and flexible asset utilization and provide customers with ongoing cyber security protection.