duplex communications

duplex / two-way channel

half-duplex

half-duplex channel

duplex

duplex load

duplex pump

duplex-geared pump

duplex communication

air-to-ground communications equipment

Allied Tactical Communications Agency (ATCA)

analog communications

area communications system

Battle Management, Command, Control, Communications and Intelligence (BMC3I)

battlespace communications network

command and communications ship

command and control communications

command communications

command communications system

command, control, communications, and computers (C4)

command, control, communications, computers, and intelligence (C4I)

command, control, communications, computers, cyber-defense, combat systems (C6)

command, control, communications, intelligence (C3I)

command, control, computers, communications, cyber-defense (C5)

commercial satellite communications (COMSATCOM)

communications (comm) (= communication)

communications agency

communications and control systems maintenance

communications and electronic security

communications and intelligence system

communications breakdown

communications by sound

communications capabilities