| Acronym | Meaning |
 | ELS | Earth Landing System (Subsystem) |
| DCIU | Digital Control And Interface Unit |
| BOF | Beginning Of File |
| GCN | Ground Communications Network (A/G Worldwide Net) |
| MA | Master |
| OCF | Orbiter Computational Facilities |
| OCDU | Optics Coupling Data Unit (G&N) |
| ECC | Engineering Change Control |
| CDU | CRT Display Unit |
| RCVS | Remote Control Video Switch |
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