Fifty years ago, sending an audio “letter” by tape was one way to keep in touch with servicemen overseas, but a home tape recorder was still a relatively rarity. So in this ad in the February 1967 issue of Popular Electronics, Radio Shack made an offer to send a tape to a GI anywhere in the world. The sender just had to come into the store, which would allow use of a recorder. They would even supply a free tape, mailer, and postage.