The Engineering Development Model (EMD) 1 King Stallion approaching homebase NAS Patuxent River with an possible concrete underslung. The prototype helicopter is assigned to Rotary Air Test and Evaluation Squadron (HX) 21 "Blackjack". The helicopter flew (according to ADSB) many oval patterns over Chesapeak Bay, far away and south of Pax, at very low level before it returned to base.