NBC suit
An NBC (nuclear, biological, chemical) suit, also called a chemsuit or chem suit or chemical suit is a type of military personal protective equipment. NBC suits are designed to provide protection against direct contact with and contamination by radioactive, biological or chemical substances, and provides protection from contamination with radioactive materials and some types of radiation, depending on the design. It is generally designed to be worn for extended periods to allow the wearer to fight (or generally function) while under threat of or under actual nuclear, biological, or chemical attack. The civilian equivalent is the Hazmat suit. The term NBC has been replaced by CBRN (chemical, biological, radiological, nuclear), with the addition of a new threat, radiological, meaning radiological weapon.
NBC Radio Network
To reflect RCA's ownership, in October 1954 some of NBC's radio and television stations' call letters were changed to "RCA"-derived callsigns. WNBC/WNBT in New York became WRCA-AM-FM-TV, WNBW television in Washington became WRC-TV, and KNBH television in Los Angeles became KRCA. By 1960, the New York flagship radio outlets reverted to WNBC-AM-FM and the television station became WNBC-TV. In 1962 KRCA in Los Angeles became KNBC (TV), while the former KNBC-AM-FM in San Francisco became KNBR-AM-FM. WNBQ television in Chicago would become WMAQ-TV in 1964.