No idea what the cargo aircraft in question was, but during the US involvement in Viet Nam, I remember hearing stories of a particular USAF cargo aircraft - piston engine powered - that had such a horrid engine MTBF that losing an engine somewhere on the trip from Hawaii to Vietnam was not uncommon. Since the US airbases were a regular target of rocket and mortar attacks, the crews would rather risk a 3-engine departure from South Viet Nam rather than having to stay there long enough to perform and engine change...