The EC 660 Whirlwind is the European Federation's main heavy lift helicopter.
Whether lifting off from a remote airstrip or dropping off supplies and equipment on the battlefield, the immense EC 660 can be relied upon to generate the artificial windstorm that is its namesake. Despite its vast size, the Whirlwind has considerable range.
Little else is known about the design. It is possible the US government would have attempted to sue the European Federation for potentially stealing technology from them. This due to the high likeness with other famous US helicopter designs such as the CH-47 Chinook and CH-46 Sea Knight.
Otherwise according to real events. One year after the release of Tom Clancy's EndWar, Boeing and Eurocopter finally came to an agreement and decided to work together to create a bigger Chinook. This would largely explain the EC 660's origin.
- The Whirlwind, like all other heavy transports, realistically would not be able to carry four armored vehicles. However, its ability to do this was likely included for gameplay reasons. The logical thing would be to carry one carry one vehicle at a time. This happens only when deploying the LV-20 Charlemagne.
- The Whirlwind bears some resemblance to the American Chinook and Sea Knight helicopters, though on a much larger scale. In 2010 Boeing and Eurocopter agreed to work on such design making it more of a coincidence the game had to real life. link