The GAU-18/A is a U.S. .50-caliber helicopter machine gun in the Browning M2/M3 family, used as door and window armament on Air Force rescue helicopters. DVIDS and Air Force-linked imagery place it on HH-60G Pave Hawk combat-search-and-rescue missions over Afghanistan and Iraq, while FN Herstal's EMGS material shows HH-60W compatibility for continued rescue-helicopter integration.
DVIDS documented a U.S. Air Force special mission aviator test-firing a .50-caliber GAU-18 from a 46th Expeditionary Rescue Squadron HH-60G over Iraq in July 2018 during regional combat-search-and-rescue support to 2014 Operation Inherent Resolve.
Defense Media Network reproduced a U.S. Air Force caption of a 26th Expeditionary Rescue Squadron aircrew member manning a GAU-18/A mounted to an HH-60G Pave Hawk over Afghanistan on 2012-02-05.
Role detailsThe GAU-18/A is treated here as the lightweight helicopter member of the Browning M2/M3 .50-caliber family rather than a stand-alone infantry gun lineage.
| Variant | Configuration | Designation notes |
|---|---|---|
 | M2/M3 family class | The GAU-18/A source excerpt identifies it as a lightweight variant of the M2/M3 family for MH-53 and HH-60 helicopters. Sources: GAU-18/A excerpt | Oliver Hazard Perry Class Frigates 2015 |
 | Later .50-caliber helicopter gun | HH-60W testing compared the legacy GAU-18 with newer GAU-21-family armament, while the GAU-21 record covers the FN M3M-derived replacement line. Sources: Tinker live-fire testing |
The GAU-18/A is documented on U.S. Air Force rescue helicopters, especially the HH-60G Pave Hawk and HH-60W Jolly Green II window-gun fit.
| Firing weapon | Weapon type | Firing evidence |
|---|---|---|
 | HH-60G Pave Hawk family | The GAU-18/A excerpt identifies USAF HH-60 Pave Hawk use, and DVIDS imagery shows HH-60G aircraft carrying or firing the gun in Afghanistan, Iraq, and stateside rescue-wing training. Sources: GAU-18/A excerpt | Oliver Hazard Perry Class Frigates 2015, DVIDS 46th ERQS GAU-18, GAU-18A .50 caliber machine gun [Image 6 of 7] |
 | Combat rescue helicopter | FN Herstal says the HH-60W windows can install the unmodified GAU-18/A through the external mounted gun system, and DVIDS imagery shows a GAU-18/A on an HH-60W during Cope Angel 2025. Sources: FN HH-60W EMGS, FN EMGS, Cope Angel 2025: U.S and Japan sharpen search and rescue skills [Image 11 of 16] |
The GAU-18/A is a .50-caliber weapon fed by linked 12.7x99 mm ammunition.
| Ammunition | Ammunition type | Firing evidence |
|---|---|---|
 | 12.7 mm heavy machine-gun cartridge | DVIDS and Air Force-linked references identify the GAU-18/A as a .50-caliber machine gun, and Defense Media Network describes the GAU-18/A as fed by a disintegrating metallic-link belt. |
The GAU-18/A is described as a lightweight M2/M3-family gun configured for helicopter mounts rather than a tripod infantry weapon. The source excerpt places it on USAF MH-53 Pave Low and HH-60 Pave Hawk aircraft, with typical left-hand feed and right-hand charging, while FN's HH-60W material adds a modern window-mount path through the external mounted gun system.
| Feature | Sourced detail | Why it matters |
|---|---|---|
| Feed direction | Left-hand feed and right-hand charging are described for the lightweight helicopter setup. | Feed and charging orientation affect how the gun is installed in the aircraft window or door station. |
| HH-60W interface | FN says the unmodified GAU-18/A can be fitted through its HH-60W external mounted gun system. | The gun remains relevant to the Jolly Green II transition even as newer GAU-21-family weapons are also tested. |
| Contingency defense | A 2022 DVIDS video shows a GAU-18 removed from an HH-60G and fired from the ground during a rescue-wing demonstration. | The installation can support a narrow ground-defense role when the gun is relocated from the helicopter. |
A U.S. Air Force photo caption reproduced by Defense Media Network placed a GAU-18/A on an HH-60G Pave Hawk over Afghanistan with the 26th Expeditionary Rescue Squadron.
Sources: Defense Media Network M2
DVIDS documented a 46th Expeditionary Rescue Squadron special mission aviator test-firing a .50-caliber GAU-18 from an HH-60G during an Iraq training mission tied to 2014 Operation Inherent Resolve support.
Sources: DVIDS 46th ERQS GAU-18
Tinker Air Force Base reported HH-60W live-fire testing with the GAU-18, describing it as the legacy .50-caliber machine gun used for the baseline comparison.
Sources: Tinker live-fire testing
A DVIDS video showed the 920th Rescue Wing firing a GAU-18 after removing it from an HH-60G to demonstrate contingency-location defense from the ground.
Sources: DVIDS GAU-18 relocation video
DVIDS imagery from Cope Angel 2025 showed a GAU-18/A on an HH-60W Jolly Green II during U.S.-Japan search-and-rescue training.
Sources: Cope Angel 2025: U.S and Japan sharpen search and rescue skills [Image 11 of 16]
