When an F-15 (or your favorite fighter aircraft) punches it's external tanks...
...to engage in combat, (or when they are empty), what happens to them?
Through my best reasoning skills and Newton's calculations, I have determined that they will fall.
But what happens when they hit the ground? Do they explode? Do they detonate at a certain height? Is this a problem? Are there regulations determining where/when pilots may pickle their tanks? Have there ever been any accidents? (E.g. houses/cows/grandmothers destroyed by falling fuel tanks?)