McDonnell Douglas FA-18 Hornet (J5024)

Is that a COMM frequency painted in the center tank? If so, what's the purpose of "advertising" it?

@Pablo Rogina
That's the emergency frequency. In the air police service, a controlled aircraft is indicated on which frequency the pilot should speak with the "air policeman".

I have to calculate how long can an airplane err in the Swiss airspace to be interecepted