The correspondent's sign-off is supposed to refer to the city where the story occurs, never simply where they are based. Also the correspondent should refer to the city only when he/she has actually been there working on the story. They can't say "...NBC News, Missoula Montana" when they've been sitting in Chicago the whole time. In that case they just say ..."NBC News" and leave it at that. NBC had a Houston bureau in the 70's and 80's, into the 90's, located next door to KPRC in the one story condo-style offices. Joyce Barnell (RIP) was the crusty old gal who ran it, but then Larry Weidman who had been news director at 2 became the bureau chief, and for several years Sandy Gilmore was the correspondent. Then NBC pulled up stakes and moved the bureau to Dallas, with Larry still serving as bureau chief. The late Jim Cummins who had been a long-time NBC reporter in Chicago became the NBC Dallas correspondent.