| Short | Meaning | Explained in | Notes |
|---|---|---|---|
| ASW | Anti Submarine Warfare | Sub Rosa (episode). | |
| AWM | Assistant Warehouse Manager | One Shot, One Kill (episode). | |
| BOL | Ball Of Light- usually associated with alien abductions or alien appearances. | Vanished (episode). | |
| BOLO | Be On the Look-Out- a notice issued to look for a major suspect in a case, ie, a murder investigation. | Switch (episode). | |
| COB | Chief Of the Boat | "Sub Rosa". | |
| CWR | Civil War Reenactors | Silver War (episode). | |
| EAM | Emergency Action Message | "Sub Rosa". | |
| EI | Enlisted Instructor | 2x15 Caught On Tape | |
| EMT | Emergency Medical Tech | High Seas (episode). | Gibbs first mentioned "Emergency Medical Tech" to Wilkes while interogating, Stan Burley later used the shorthand form "EMT". |
| EOD | Explosive Ordnance Disposal | Missing (episode). | Incorrectly printed as "Explosive Ordinance Disposal" on a billboard within the Quantico base. |
| GIB | Guy In Back | The Curse (episode). | Alternative naming for the "RIO" on a plane. |
| GSM | Get Some Magazine | Bikini Wax (episode). | |
| HEAA | High Explosive Anti Armor | Split Decision (episode). | Rocket type for a SMAW. Leaves a hole. |
| HEDP | High Explosive Dual Purpose | "Split Decision". | Rocket type for a SMAW. Leaves a crater. |
| HRT | Hostage Rescue Team | Bête Noire (episode). | |
| ICF | Irregular Confederate Forces | 3x04 Silver War | |
| IM | Instant Message | 2x20 Red Cell | like an e-mail but live |
| JSOC | Joint Special Operations Command | 2x01 See No Evil | |
| LEO | Law Enforcement Officer | 1x01 Yankee White | |
| LES | Leave and Earnings Statement | 1x09 Marine Down | |
| LOD | (in the) Line Of Duty | 1x09 Marine Down | |
| MECEP | Marine Corps Enlisted Commissioning Educational Program ([1]) | 1x13 One Shot, One Kill | Kate only says "Marine Enlisted Commissioning Program". |
| MMORPG | Massive Multiplayer Online Role Playing Game | 1x04 The Immortals | |
| MOUT | Military Operations -- (in Urban Terrain) | 2x15 Caught On Tape | McGee didn't allow Tony to finish explaining. |
| MSG | Marine Security Guard | 3x04 Silver War | |
| NCIS | National Crop Insurance Service | 1x23 Reveille | |
| POI | Person Of Interest | 2x15 Caught On Tape | |
| PSA | Personnel Support Activity | 2x04 Lt. Jane Doe | |
| RIO | Radar Intercept Officer | 1x05 The Curse | also called "GIB"s. |
| SHC | Spontaneous Human Combustion | 2x08 Heart Break | |
| SK | Store-Keeper | 3x05 Switch | |
| SMAW | Shoulder-launched Multi-purposes Assault Weapon | 1x21 Split Decision | |
| SMU | Special Military Unit(s) | 2x01 See No Evil | |
| TAT | Tactical Analysis Team | 2x17 An Eye For An Eye | |
| TBA | Tri-Border Area | 2x17 An Eye For An Eye | |
| TBI | Truth By Intimidation | 2x03 Vanished | According to Tony, this is how Gibbs gets even the most stubborn and toughest of suspects to reveal what they're hiding. |
| TFOA | Things Fallen Off Aircraft | 1x05 The Curse | |
| UAV | Unmanned Aerial Vehicle | 2x23 Twilight |
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