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 The term NBC has been replaced by CBRN (chemical, biological, radiological, nuclear), with the addition of a new threat, radiological, meaning radiological weapon.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 chimes
A commonly suggested explanation for the chimes' "G-E-C" sequence is that it comes from the initials of the General Electric Company (GE). In 1987, Robert C. Wright, the president and C.E.O. of NBC, testified before the U.S. Congress that "Not everyone knows that GE was one of the original founders of RCA, NBC's former parent, and that the notes of the famous NBC chimes are G-E-C, standing for the General Electric Company." References to this purported link date back to at least 1945. However, this was over a decade after the NBC chimes were adopted, and NBC's own early historical reviews make no mention of this supposed origin.