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Here we see a great and very rare, maybe even unique picture of former US president Ronald Reagan using a STU-II secure telephone: President Reagan making an early morning telephone call regarding the invasion of Grenada (Photo: Reagan Library , October 22, 1983) In this picture we see president Reagan making a phone call to his staff regarding the invasion of Grenada . Because he was staying at the Eisenhower cabin on the Augusta National Golf course in Georgia, it was necessary to create a secure telephone line with the White House. This was done by installing a STU-II , which was the second generation Secure Telephone Unit (STU). This system was introduced by the NSA in the early 1980s, and replaced older systems, like the extremely bulky KY-3, and was the successor to the STU-I. In the picture we see the STU-II telephone, with handset, a normal keypad, some indicator LEDs and three extra buttons at the bottom, for selecting secure or nonsecure mode. This phone only acted as termi...