Helicopter Sikorsky MH-60S Seahawk Serial Register 166321 used by US Navy USN. Built 2004. Aircraft history and location Aircraft History 166321 US Navy 2004-09 Delivered to HC-11 September, 2004. I was the Crew Chief on the delivery flight from Stratford, CT HC-11 2005HSC-21 /VR-75 Jack HSC-21 2012HSC-23 /WC-44 HSC-23 2018-03VR-72Oct21 still HSC-21 Send Updates Use APP to upload photo @ (optional) When Now? / / Send