At least one, I am sure.
Actually, I spelled it wrong - LAPES
I cannot imagine the COG shift, when twenty-some TONS pops off the extreme rear or the ramp - but I bet the pilot pees himself.
God bless the men that fly and fight. Training kills more pilots than combat.
There was also a scheme at the same time called the “Ground Proximity Extraction System” which involved using grappling hooks tossed out the back of the aircraft to engage arresting cables on the ground to pull the cargo out of the aircraft.
That one didn’t go very far either; I believe it also cost several aircraft in the development process.