T28B: Hmm, did the American Navy borrow this idea from the Kirov cruiser's helicopter hangar idea?
T28B. I believe the Zumwalt does not have a below deck hangar or elevator like the Kirov- just a straight in traditional hangar in the aft end of the main superstructure, just like most every US Destroyer, frigate or cruiser that has a hangar has had for decades. The track lines you see on the deck are for winching helos/UAVs in and out, not elevator outlines.
A better question would be did the Kirov borrow their hangar/elevator idea from the US CGN Virginia class? which may have borrowed the below deck idea from the USS Baltimore class of WWII era.....