High Quality Content by WIKIPEDIA articles! The AN/USQ-20, or Naval Tactical Data System (NTDS), was designed as a more reliable replacement for the AN/USQ-17 with the same instruction set. The first batch of 17 computers were delivered to the Navy starting in early 1961. A version of the AN/USQ-20 for use by the other military services and NASA was designated the UNIVAC 1206. Another version, designated the G-40, replaced the vacuum tube UNIVAC 1104 in the BOMARC Missile Program.

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