Joint Base Lewis-McChord is a major Army garrison, with much of the 2nd Infantry Division in residence, along with Headquarters, 7th Infantry Division; 593rd Expeditionary Sustainment Command; and 1st Special Forces Group. However, Headquarters 7th Infantry Division is primarily a garrison management body. Fort Lewis's geographic location provides rapid access to the deep water ports of Tacoma, Olympia and Seattle for deploying equipment. Units can be deployed from McChord Field, and individuals and small groups can also use nearby Sea-Tac Airport. The strategic location of the base provides Air Force units with the ability to conduct combat and humanitarian airlift with the C-17 Globemaster III.