Analysis of information sources in references of the Wikipedia article "Faca de luta" in Portuguese language version.
some say that it was in the mid-'80s when the phrase became popular to describe Bob Terzuola's ATCF (Advanced Technology Combat Folder). Others credit Ernie Emerson's CQC-6 (also called the “Viper 6”) conceived in the late '80s as being the model to help popularize the tactical folder.