REFUELING OPERATION U.S. Army Sgt. Stephanie Ziety refuels an incoming UH-60 Black Hawk helicopter during Operation United Assistance in Tapita, Liberia, Dec. 19, 2014. Ziety is a crew chief assigned to the 1st Armor Division's Company B, 2nd Battalion, 501st Aviation Regiment. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 790262-J-BJK55-341.jpg Photo Gallery