All police officers shall meet the minimum standards for licensing as a peace officer as established by the Texas Commission on Law Enforcement Officer Standards and Education and have a current and valid peace officer license at the time of appointment. All police officers shall retain such license during their employment as a police officer with the city and will be subject to discharge if such license is suspended, revoked, or becomes invalid for any reason. In addition, all police officers must have a valid Texas vehicle operator's license and must be insurable as a vehicle driver by the city's automobile insurance carrier.