SCOTT AIR FORCE BASE, Ill. - Two Air Mobility Command C-17 Globemaster IIIs departed the United States on March 12 and delivered search and rescue, or SAR, equipment and personnel to Japan in support of humanitarian relief efforts after an earthquake and tsunami struck the island nation March 11.

President Barack Obama pledged U.S. support, emphasizing that "the friendship and alliance between our two nations is unshakeable, and only strengthens our resolve to stand with the people of Japan as they overcome this tragedy."

The first C-17 mission, operated by a 62nd Airlift Wing crew from McChord Field, is transporting California-based SAR equipment and personnel from Los Angeles to Misawa Air Base, in northern Japan, TACC facts show.

The second mission, operated by a 436th Airlift Wing crew from Dover Air Force Base, Del., is transporting Virginia-based SAR equipment and personnel from Fairfax County to the same destination.

In addition to the C-17s, two KC-10 Extenders from the 60th Air Mobility Wing at Travis AFB, Calif., are supporting the operation by providing in-air refueling to the C-17s over the Pacific Ocean.

Without the KC-10s, the C-17s would need to land and refuel on the ground adding two to three hours on to each mission, according to officials.

In addition to the C-17 and KC-10 forces, AMC also has additional aircraft and crews prepared to respond if further assistance is requested.

Mission planning and command-and-control for the AMC portion of the humanitarian effort is conducted by AMC's Tanker Airlift Control Center at Scott AFB, Ill.

As AMC's hub for global operations, the TACC plans, schedules and directs a fleet of nearly 1,300 mobility aircraft in support of strategic airlift, air refueling, and aeromedical evacuation operations around the world.

In addition to supporting U.S. military personnel in Iraq and Afghanistan, AMC's global mission includes humanitarian airlift in response to global events, such as the case with supporting relief operations in Japan.