McCHORD AIR FORCE BASE, Wash. -

Two C-17 cargo planes from McChord Air Force Base are on their way to assist in Haiti relief efforts.

The planes left Sunday morning, one for Langley Air Force Base in Virginia and the other to Pope Air Force Base in North Carolina. They'll pick up specialized teams and relief supplies to bring to Haiti, which was devastated by a magnitude-7 earthquake Tuesday.

Two other C-17s and four aircrews remain on alert at McChord for additional humanitarian relief missions.