Well, I'm sorry if I got it wrong, since nobody really said dolphin spamming (I may have missed it in the skimming), but Dolphins are the same case as Jaguars : cheap, weak and very fast, obviously should be spammed. Considering their vanilla weapon was so uber strong, I really don't think that is an option for MO. It's also a great detector and can get away from shots quite easily.
Even if it's not to be spammed, consider what the previous posters said about Destroyers detection range. In reality Destroyers can send Ospreys far more than their line of sight (22(!) cells), which makes dolphin pretty useful at scouting out subs without putting your ships at risk. It's also great for Aircraft Carriers to snipe ships from afar, considering their Hornets are more accurate than the other siege flagships (barring Leviathan to a degree).
EDIT : In fact, it's in the description
One of the initially controversional, and then most successful ideas was an attempt of training Dolphins for usage in the Allied navy. Those nimble mammals were capable of swiftly scouting nearby areas, and if any threat was found, a system of sensors would immediately send enemy coordinates to nearby units. With their assistance, Destroyers could intercept Soviet submarines from much larger distance. The roles have been reversed and the hunters became the hunted.
To amplify potential of Dolphins they have been equipped with another type of Comet Prism weapons which are mounted on their backs. With those, they could attempt to engage not only enemies on waters, but also take down some targets at the shores. Right now, Dolphins remain in the Allied army as main scout and detection force, but when amassed, they become a force to be reckoned with.
Edited by Handepsilon, 10 April 2019 - 10:15 AM.