Sprint made it an integral part of their long distance adverting in the mid-80s: <a href="http:&#x2F;&#x2F;www.retroist.com&#x2F;2014&#x2F;11&#x2F;18&#x2F;sprints-pin-drop-commercial&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.retroist.com&#x2F;2014&#x2F;11&#x2F;18&#x2F;sprints-pin-drop-commerci...</a><p>They also counter advertised against MCI, founded as Microwave Communications, Inc., on the basis of their using fiber and MCI still using a lot of microwave.  From <a href="http:&#x2F;&#x2F;www.fundinguniverse.com&#x2F;company-histories&#x2F;sprint-corporation-history&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.fundinguniverse.com&#x2F;company-histories&#x2F;sprint-corp...</a>  E.g.:<p>&quot;<i>In a spirited demonstration of the obsolescence of the microwave networks operated by AT&amp;T and MCI, US Sprint blew up one of the last of its own microwave towers in February 1988.</i>&quot;<p>I remember seeing a print add at the time with a picture of the controlled demolition in progress.