The latest Navy ship class has entered service. The replenishment oiler USNS John Lewis (T AO 205) is the first of class and 19 others are coming; the second of the class has undergone sea trials. The crew consists of 99 civilian mariners, with no mention of an active-duty Navy detachment. It looks to me like it has a helo deck, but no hangar.
Sort of an odd-looking stack? Diesel power.
https://en.wikipedia.org/wiki/USNS_John_Lewis