The 43-year run of the UN-1N Iroquois helicopter, better known as the “Huey,” is coming to an end this September.

The U.S. Marine Corps will replace the long-standing UN-1N, built by Bell Helicopter, with the upgraded UH-1Y Venom, according to Sea Power Magazine.

The last UH-1Ns are being operated by Marine Light Attack Helicopter Squadron 773 (HMLA-773), a reserve squadron, Sea Power Magazine reported.

HMLA-773 already has begun transition to the UH-1Y. The squadron also operates the AH-1W Super Cobra gunship version.

Deliveries of the UH-1N to the Marine began in 1971. The Navy and Marine Corps procured 205 UH-1Ns, plus six VH-1N executive transports for Marine Helicopter Squadron One, the unit that provides transportation for the president of the United States. Ten UH-1Ns were remanufactured to UH-1Ys, after which the Corps decided to procure new UH-1Ys from Bell.q