Essential and marginal functions may require maintaining physical condition necessary for sitting, walking, or standing, lifting, pushing, pulling, twisting, throwing, reaching, squatting, stretching, bending for prolonged periods of time; at times lift and carry as much at 50 lbs. Participates in fuel transfers to and from vessels, including handling lines for ships, connecting hoses and safety lines, operating flow control valves, and recording operational data related to the transfers.