Every F-35 squadron, no matter the country, has a 13-server ALIS package that is connected to the worldwide ALIS network. Individual jets send logistical data back to their nation’s Central Point of Entry, which then passes it on to Lockheed’s central server hub in Fort Worth, Texas. In fact, ALIS sends back so much data that some countries are worried it could give away too much information about their F-35 operations.

Source: F-35’s Hacking Vulnerability | Could the F-35 Be Hacked?

Hackers could conceivably introduce bad data in the JRE that could compromise the safety of a mission, shortening the range of a weapon system so that a pilot thinks she is safely outside the engagement zone when she is most certainly not.

It’s highly likely these vulnerabilities are a known detectable exploit vector.  Any military aircraft  should be able to perform its mission disconnected from a network — except for perhaps drones.