The MH-53E Sea Dragon is the Western world's largest helicopter. The MH-53E is used primarily for Airborne Mine Countermeasures (AMCM), with a secondary mission of shipboard delivery. AMCM missions include mine sweeping and ancillary spotting, mine neutralization, floating mine destruction, channel marking, and surface towing of small craft and ships. Additional mission capabilities include air-to-air refueling, hover in-flight refueling, search and rescue, and external cargo transport operations, in both land and seaborne environments. The MH-53E Helicopter also has the ability to perform Vertical Onboard Delivery (VOD) missions as well as transportation of personnel and cargo.