COD wasn't "testing various modes." It was a completely new requirement to replace Navy C-2s which were reaching end of life. It wasn't part of the original contract; it was a completely new "oh, we have this on the shelf and it's fit enough for purpose."
Yeah fair, I jumped to that since it was in the Wiki but through the 2010's there were a number of other options for development milestones.
Except it isn't - the V-22 fleet is currently limited to flight 200nm or less due to mechanical concerns. [1] I'm not sure what the US Navy is currently doing or planning for near-future COD. (Beyond ordering more Ospreys. [2]) Pray they don't end up in a real hot war with a peer adversary, I guess?
1. https://news.usni.org/2025/02/11/navy-marines-learning-to-ma... 2. https://www.armyrecognition.com/news/navy-news/2025/us-navy-...