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 The term NBC has been replaced by CBRN (chemical, biological, radiological, nuclear), with the addition of a new threat, radiological, meaning radiological weapon.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
For many years, NBC was closely identified with David Sarnoff, who used it as a vehicle to sell consumer electronics. RCA and Sarnoff had captured the spotlight by introducing all-electronic television to the public at the 1939–40 New York World's Fair, simultaneously initiating a regular schedule of programs on the NBC-RCA television station in New York City. President Franklin D. Roosevelt appeared at the fair before the NBC camera, becoming the first U.S. president to appear on television on April 30, 1939 (an actual, off-the-monitor photograph of the FDR telecast is available at the David Sarnoff Library). The broadcast was transmitted by NBC's New York television station W2XBS Channel 1 (later WNBC-TV; now WNBC, channel 4) and was seen by about 1,000 viewers within the station's roughly coverage area from its transmitter at the Empire State Building.