. However, low-frequency noise modulation was shown on the bench test to give "an excellent discrimination function with no sec- ondary peaks." The Sylvania team recognized that noise modulation was "very appealing from the antijamming and security aspects," but its utility in WHYN was questionable since the recording and reproduction requirement in the actual system would be severe. Accordingly, electronic generation of a repro- ducible multitone modulation function remained the preferred approach. Although the above are quoted from [97], these revealing results were in classified print by October 1948 [98], simultaneously with Shannon's open publication of pseudorandom signalling. When Republic Aviation's missile development was discontinued, Sylvania work proceeded on WHYN under the auspices of the Air Force's Watson Laboratories [later to become the Rome Air Development Center (RADC)] with this support spanning the 1948-1952 time frame. Noise modulation never made it into the WHYN system, but correlation detection certainly did. In fact, it was noted [99] in 1950 that "Had the full significance of cross- correlation been realized [at the beginning], it is probable that the name [WHYN] would be different." Advocacy (see Figure 2.11) of correlation detection reached an artistic peak when the following classified Sylvania jin- gle was heard at a 1950 autumn meeting in Washington. Correlation is the best, It outdoes all the rest, Use it in your guided missile And all they'll hear will be a whistle. Whistle, whistle, whistle Sung to the tune of a popular Pepsi-Cola commercial, this bit of creativity may have been inspired by the arrival, at Sylvania's helm, of Pepsi's chief executive. The earliest public disclosure of the concept which had evolved in the first WHYN study appears circumspectly in the last paragraph of an October 1950, article by Leifer and Marchand in the Sylvania Technologist [101]: The factors determining signal bandwidth and receiver noise bandwidth are entirely different; in the former it is re