USNS Mercy An MH-60S helicopter attached to the "Blackjacks" of Helicopter Sea Combat Squadron 21 lands on the Military Sealift Command hospital ship USNS Mercy, Sept 25, 2019. SHARE IMAGE: Download Image: Full Size (0.4 MB) Photo By: Navy Petty Officer 3rd Class Harley Sarmiento VIRIN: 190925-N-NH199-1323M.JPG Photo Gallery