Combined diesel or gas

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What Wikipedia says

Combined diesel or gas (CODOG) is a type of propulsion system for ships that need a maximum speed that is considerably faster than their cruise speed, particularly warships like modern frigates or corvettes.

Excerpt from the Wikipedia article “Combined diesel or gas”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Alureiter (image d'origine) ; Rogilbert (traduction), Public domain, via Wikimedia Commons.