Military Helicopter Type Designations
U.S. military helicopters are usually prefixed with a type designation from this list. However, there are exceptions so this system cannot be called universal:
- AH - Attack Helicopter.Carries weapons used for ground support.
- CH - Cargo Helicopter.Cargo transport, replacing trucks.
- HH - Heavy Helicopter. Large rescue helicopters not otherwise classified.
- MH - Special Operations Helicopter.
- OH - Observation Helicopter.Primary use is reconnaissance.
- RH - Minesweeping Helicopter.
- SH - Anti-submaarine Warfare Helicopter.
- TH - Training Helicopter.
- UH - Utility Helicopter.Troop transport, replacing trucks.
When military helicopters were first procured during World War II, they were designated with numbers like R-4 (R for Rotorcraft). In 1948, the U.S. Army Air Force changed the designation from R to H (Helicopter), renaming existing models. On 9 July 1962 the modern prefix system was adopted and again existing models were renamed, e.g. H-19 redesignated UH-19. Helicopters with an X prefix are experimental, with Y prefix are pre-production.
Chart of Military Helicopters
In this chart of military helicopters, click on the photo link to go to the page of photos and information for the specific helicopter.

