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The SIT434CI is one of a family of IFF Mk XA and National Secure Mode (NSM) and Mode S interrogators developed under the multinational New-Generation IFF (NGIFF) programme in order to provide a state-of-the-art IFF interrogation capability. Military identification is available with Mode 4-like NSM, supported by an external cryptographic computer. Mode S is also provided in order to monitor civilian air traffic to support situational awareness.