; (4) transition from leaded fuel usage by commmercial and general aviation; and (5) any other issues that the Secretary of Transportation and the Secretary identify as issues of joint interest: Provided further , that the Joint Office shall coordinate with Department of Transportation and Department of Energy offices with jurisdiction over aviation decarbonization, including the Department of Transportation Federal Aviation Administration, and the Department of Energy’s Bioenergy Technology Office, Hydrogen and Fuel Cell Technologies Office, and Vehicle Technologies Office, as well as with other Federal agencies with jurisdiction including the Environmental Protection Agency, the National Aeronautics and Space Administration, the Department of Defense, including the Air Force and Space Force, and the Department of Agriculture, to streamline and coordinate efforts to reduce aerospace emissions: Provided further , that the Joint Office shall, in addition to the other duties listed in this paragraph, study, plan, coordinate, and implement issues of joint concern between the two agencies with respect to low or zero emissions vessels and ports, including at a minimum: (1) research and technical assistance related to the development, certification, operation, and maintenance of low or zero emission vessels, medium and heavy duty transportation vehicles, and relevant port equipment, refueling and charging infrastructure, power supply and distribution infrastructure, alternative sustainable low-carbon fuels and fueling infrastructure including biofuels, clean hydrogen, methanol and ammonia, and associated technologies critical to their deployment; (2) data sharing with respect to the installation, operation, maintenance, and utilization of charging and refueling infrastructure at ports and freight facilities; (3) development and deployment of workforce training programs related to the development, construction, and maintenance of vessels, equipment, and charging and refueling infrastructure