A Helicopter Combat Support Squadron 4 (HC-4) CH-53E Super Stallion helicopter and a Fleet Logistics Support Squadron 59 (VR-59) C-9B Skytrain II aircraft stand by at the airfield during a supply delivery for U.S. Navy, Marine Corps and civilian personnel during Operation SHARP EDGE. The U.S. military units are in western Africa to protect Americans living in Liberia from that country's political unrest