A longtime Mardi Gras tradition is in jeopardy because of the labor fight between New Orleans firefighters and Mayor LaToya Cantrell’s administration: the fire trucks that roll at the end of each Carnival parade. Firefighters’ union president Aaron Mischler said Friday that fire truck crews have been instructed to conduct safety inspections on floats and flambeauxs before each parade — but then return to their stations to answer calls for service rather than trail the processions. A screenshot of an email to various New Orleans Fire Department members from a deputy chief, which the union provided Friday, says that “there will be no rear unit at the end of any parade during this Mardi Gras season” by orders of Superintendent Tim McConnell.