no one ever brings up radioing the base. After the crash the first thing the Captain suggests is finding a student to pilot the aircraft, which is really weird especially in a military setting. I'm pretty sure what should happen is to radio for help or radio that there's been a crash. Then when the aircraft that rescues them, which is a military aircraft, has to do an emergency landing there's also no radioing for help.
Actually, even before that when they were going to land on what they thought was some support tower they never radioed the tower to be open for landing. This sort of no communication between aircrafts and bases is at best odd when in a sort of post-apocalyptic military setting. Like how would you know if an aircraft wasn't an enemy aircraft without communicating with that aircraft? It just doesn't make sense, and definitely isn't secure or safe, for a military/research base/support tower to not have protocols to identify aircraft.
It just doesn't make sense for aircraft to not seem to have any way of communication at all. I mean the WN has some sort of pilot simulation pit thing but they don't have radios or something? This is a post-apocalyptic military like setting, why don't the military aspects so far make sense?