Why convert jet to outboards

[dbq]

I am wondering why I have seen several boats that were originally inboard diesel jets converted to outboards. Can anybody advise on this. The boats I have seen here in the U.S. have been ex-military USMI and Bollinger ribs. Thanks

[beamishken]

Probably because jets are inefficient & don't perform well in comparison to an equivalent propeller installation also possibly ex military might have duff engines & it's far cheaper to re power with outboard petrol than inboard diesel & ongoing maintenance is far cheaper