This Cessna U206F Stationair was used by Evergreen Helicopters in 1985 for logistics support and seen outside the company's offshore oil and gas support hangar at Galveston Airport. It was based in west Africa from 1987 until at least 1994 supporting Evergreen's contract with the World Health Program (WHO/OMS) which used 12 MD500 helicopters and three Turbo Thrushes to spray larvicide in rivers to kill the parasitic worm that caused the disease ONCHO (Onchocerciasis or river blindness). This Cessna is now preserved at the Evergreen Air Museum in McMinnville, OR in its WHO/ONCHO markings.