| A/D | Analog to Digital | CIU | Command Isolation Unit
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| AFD | Automatic Fault Dection | CMDB | Command Buffer
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| AFSCF | Air Force Satellite Control Facility | COMB | Communications Buffer
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| AGC | Automatic Gain Control | COMSEC | Communications Security
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| AIL | Airborne Instruments Laboratories | CRT | Cathode Ray Tube
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| AM | Amplitude Modulation | CT | Control Transformer (Syncro)
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| ANK | Alphanumeric Keyboard | CX | Control Transmitter (Syncro)
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| ATU | Analog Test Unit | DCB | Display Control Buffer
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| Az | Azimuth | DCD | Digital Command Decoder
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| BB | Bird Buffer | DCE | Digital Command Encoder
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| BCD | Binary Coded Decimal | DE | Display Electronics
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| BER | Bit Error Rate | DoD | Department of Defense
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| BST | Boresight Tower | DRE | Digital Ranging Equipment
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| BSU | Baseband Separation Unit | D/S | Digital-to-Synchro
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| Carrier 1 | Composite Baseband of Multiplexed SGLS Data
| DSB | Digital Slave Bus
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| Carrier 2 | PCM Baseband of SGLS Data | DSBRU | Digital Slave Bus Receive Unit
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| Carrier 3 | Non SGLS Wideband Anolog Data, FM Multiplexed or High Rate PCM Baseband Data
| DSBTU | Digital Slave Bus Transmit Unit
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| CAU | Crypto Ancillary Unit | ECP | Engineering Change Proposal
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| CBSU | Command Buffer Switching Unit | EL | Elevation
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| C&D | Control and Display | ERP | Effective Radiated Power
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| CDC | Control Data Corporation | FFK | Fixed Function Keyboard
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| CDAB | Computer Dual Access Buffer | FM | Frequency Modulation
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| CDAD | Computer Access Driver | FPA | Flat Plane Array
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| CEI | Contract End Item | FSK | Frequency Shift Key
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