Federal Firefighters Workforce Support Act This bill requires the Department of Defense (DOD) to ensure that members of the Armed Forces and employees of defense agencies who provide fire protection services to military installations comply with the National Consensus Standards developed by the National Fire Protection Association. DOD must also ensure the minimum staffing requirement for any firefighting vehicle responding to a structural building emergency at a military installation is not less than four firefighters per vehicle and the minimum requirement for such vehicle responding to an aircraft or airfield incident is not less than three firefighters per vehicle.