You can see how it might be difficult, in 2026, to make yet another show about federal agents stand out. Already there are shows titled FBI and CIA and Marshals, shows about people in the FBI or the CIA or the Secret Service but not named after them, shows about their international counterparts. NBC’s latest addition to that catalogue tries to distinguish itself by taking a more maximalist approach to the genre, and wedding it to another well-worn TV genre besides. Line of Fire is not about any one of those agencies but the whole alphabet soup of them, as filtered through the experiences of a single flawed but loving family. If it’s not…