The National Guard will be in charge of security, and safety. This will be evident from the front of the airport, all the way towards the boarding gates. Contraband sniffing dogs will be prevalent on the scenes looking for illegal drugs and explosives. Metal detectors will be required from everyone that would be waiting for airplanes. The National Guard will also be in charge of screening passengers, and randomly requesting ID from the person they approach.
Since the National Guard is in charge of security, there is no need to employ security guards, and the National Guard that would be in charge of protecting the airport will go through additional training to detect would be bad actors based on the behavior of said bad actors.