| Acronyms | Meaning / Significance |
Source |
| H&FS | headquarters and facilities sub-system | |
| HAGS | commander Hellenic army general staff | |
| HANE | high altitude nuclear event | |
| HARM | high-speed anti-radiation missile | |
| HASSO | host ADP site security officer | |
| HAU | host attachment unit | |
| HCD | hard copy device | |
| HCDA | high capacity digital access | |
| HCI | human computer interface | |
| HDA | Heterogeneous Data Accessor | |
| HDB | home defense brigade | |
| HDLC | high level data link communication | |
| HDLC | high level data link control | |
| HDRP | hypothetical digital reference path | |
| HDX | half duplex | NACISA/APD/04.07.00(95)001 |
| HEDICS | Hellenic national defense integrated communication system | |
| HEL | high energy laser | |
| HF | high frequency | |
| HFA | Hellenic first army | |
| HGI | host guard interface | |
| HIDECON | hierarchially decentralized control of the network | |
| HILEX | high level exercise | |
| HIT-B | Ex Strong Resolve 95 | |
| HL | hotline | |
| HLDD | high level design document | STC CSNI final report 22/9/95 |
| HLI | ||
| HLWF | high level wargame facility | |
| HM | hub manager | Ex Strong Resolve 95 |
| HML | hardware maintenance level | |
| HN | host nation | NACISA USD 23.01.00(93)01 |
| HNDGS | commander Hellenic national defense general staff | |
| HOD | head of delegation | |
| HOL | high order language | |
| HPRP | high performing reporting post | early warning |
| HQ | headquarters | |
| HQG | high quality graphics | DT=SVC+SVTC+HQG |
| HRC | hybrid ring control | |
| HRDL | hypothetical reference digital link | |
| HRDS | hypothetical reference digital section | |
| HSC | headquarter support command | |
| HSO | headquarter suignal officer | |
| HTML | HyperText Mark-up Language | W3C |
| HTT | highly transportable satellite ground terminals | |
| HTTP | HyperText Transfer Protocol | |
| HW | hardware | |
| HYPSR | half yearly project status report | NACISA |
| HYSIR | half yearly system implementation report | |
| HYTIME | hypermedia/time-based structuring language |