At this time there is no requirement from TSA stating operators must issue a specific ID badge to employees. These are regional requirements by airports and Fixed Base Operators. However,in its 2017 "Security Guidelines for General Aviation Airports and Users," TSA does mention airports may want to look into card identification systems for employees.

Presently NATA, NBAA and other associations have published best practices for business aviation. Among the best practices, it is highly recommended that all employees be issued and clearly display ID badges at all times when at the airport. This is for the security of both employees and society as a whole. Too often there have been incidents of people impersonating officials, employees or aircraft owners to gain access to secure areas.

• More FBOs are now requiring ID badges or taking sensitive personal information from your pilots prior to issuing a temporary badge so they can access the flight line (i.e. Government-issued photo ID and FAA pilot certificate). Having a credential already in hand will reduce the time it takes for your employees to access these areas.
• An ID badge allows customers to easily identify your employees, making it easier for your employees to gain their trust.
• Many businesses provide discounts or other benefits to crewmembers. A professional credential that identifies your crew will help facilitate this.

• If an employee is having a bad day or providing poor customer service, a credential will allow customers to easily identify that individual to upper management.
• A credential worn at all times improves the safety and security of your employees by preventing outsiders from entering the premises without proper identification. 
• Any basic credential will have the company logo or name printed directly on the ID which will enhance the overall brand recognition of your company.

• NATA Compliance Services (NATACS) currently offers two types of credentials. CrewID^™ and the Known Crewmember^® badge.