What does TACAN stand for?

Tactical Aid to Navigation (SAUS)

Tactical Air Command and Navigation - System (NAKS)

Tactical Air Control and Navigation (SAUS)

Tactical Aircraft Navigation (DOMA)

Tactical Air Navigation - Military aircraft operations

Tactical Control and Navigation (SAUS)

Tactical Control and Navigation System - Military technology (DDF)

Theoretic and Calculated Air Navigation (ACAE)