Maintenance crewmen work on an external fuel tank from a Helicopter Combat Support Squadron 4 (HC-4) CH-53E Super Stallion helicopter at the Lungi airport, just north of Freetown, Sierra Leone, during Operation Sharp Edge. A detachment from HC-4 is working in conjunction with amphibious ready group that is in place off the coast of Liberia to provide support for the U.S. Embassy in Monrovia, Liberia, and evacuate civilians caught in that country's civil war