[krisoft]

> I wonder if some of the "autopilot" functionality for military aircraft is to swan-dive into water/forest if everyone has already ejected.

Not quite the same you are thinking about but something similar is documented behaviour of the Global Hawk. Obviously since that is a remotely piloted aircraft “everyone has ejected safely” is not the trigger for it.

The way it works at the flight planning stage the operators define pre-determined points, and if the system detects certain faults it cannot recover from it tries to fly to these points and crash land into them. They call these point “termination point” on land and “ditching point” over water.

In this document[1] you can read more about the selection criteria of such points.

This document[2] details for air traffic control under which conditions flight termination points are used. In short (page 22) when the aircraft is uncontrolable for landing or landing at a suitable airfield cannot be achieved safely.

1: https://static.e-publishing.af.mil/production/1/af_a3/public...

2: https://www.eurocontrol.int/sites/default/files/2019-05/atm-...