Acid, or of the 4.
ORBITER VOICE COORDINATION PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE ORBITER DATA, VOICE COORDINATION PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE ORBITER.
ORBITER VOICE COORDINATION PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE ORBITER DATA, VOICE COORDINATION PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE ORBITER.