The National Investigative Committee of Aerial Phenomenon, a.k.a NICAP was a UFO research group that was active in the United States from the 1950's to the 1980's, making their appearances in the X-Files outdated. 

Max Fenig was affiliated with NICAP. When he was captured in a cell with Mulder, he was seen wearing a NICAP baseball cap. (TXF: "Fallen Angel")

Later on in the series we can see a similar cap on coat rack in Mulder's office with the letters "NICAP" are on it. (TXF: "Beyond the Sea")

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