| Abbreviation | Definition |
|---|---|
| HEFOE | Hydraulic Electrical Fuel Oxygen Engine |
| HEI | High Explosives Incendiary |
| HE-I | Hydraulic Excavator type I |
| HEIAC | Hydraulic Engineering Information Analysis Center |
| HEIAC | ydraulic Engineering Information Analysis Center |
| HEIAP | High Explosive Incendiary Armour Penetrating |
| HE-II | Hydraulic Excavator type II |
| HE-III | Hydraulic Excavator type III |
| HEL | Heavy Equipment Lab |
| HEL | Helicopter |
| HEL | Hell's Elite Legion |
| HEL | Human Engineering Laboratory |
| HELAR | High Energy Laser Array |
| HEL-H | Heavy Helicopter |
| HEL-L | Light Helicopter |
| HELLFIRE | Heliborne Fire-and-Forget Systems |
| HEL-M | Medium Helicopter |
| HELO | Helicopter |
| HELOVA | High Energy Low Vulnerability |
| HELP | Heat Escape Lessening Position |