What does TDDS stand for?

Tactical Data Display System (MCD)

Tactical Data Distribution System - Military technology (DDF)

Talking Directory Display System - FTA (TAG)

Teacher Development in Desegregating Schools - Office of Education

Television Data Display System (KSC)

Topographic Digital Data System (SAUS)

Track Data Display System (ACAE)

TRAP- Tactical Related Applications Data Dissemination System - Provides worldwide dissemination of high-interest ELINT, contact reports, and parametric information (MLEX)

Two-Dimensional Deflection System (IAA)