C-17s depart JB Charleston for Exercise Mobility Guardian

Senior Airman Raymond Salas, 15th Airlift Squadron C-17 Globemaster III loadmaster, secures luggage and cargo here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Senior Airman Raymond Salas, 15th Airlift Squadron C-17 Globemaster III loadmaster, secures luggage and cargo here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Airman 1st Class Jamar Finnie, right, 437th Aircraft Maintenance Squadron instrument and flight control systems apprentice and Tech. Sgt. Timothy Smith, 437th AMXS, conduct prelaunch checks for a C-17 Globemaster III here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Airman 1st Class Jamar Finnie, right, 437th Aircraft Maintenance Squadron instrument and flight control systems apprentice and Tech. Sgt. Timothy Smith, 437th AMXS, conduct prelaunch checks for a C-17 Globemaster III here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Senior Airman Raymond Salas, 15th Airlift Squadron C-17 Globemaster III loadmaster, conducts prelaunch checks for a C-17 here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Senior Airman Raymond Salas, 15th Airlift Squadron C-17 Globemaster III loadmaster, conducts prelaunch checks for a C-17 here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Capt. Brian Guiney, 16th Airlift Squadron C-17 Globemaster III pilot, briefs aircrew members here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Capt. Brian Guiney, 16th Airlift Squadron C-17 Globemaster III pilot, briefs aircrew members here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

U.S. Air Force reservists and active-duty members conduct prelaunch checks for a C-17 Globemaster III here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

U.S. Air Force reservists and active-duty members conduct prelaunch checks for a C-17 Globemaster III here, prior to departing for Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Airman 1st Class David Jackson, 437th Aircraft Maintenance Squadron, marshals out a C-17 Globemaster III here, as it prepares to depart to Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

Airman 1st Class David Jackson, 437th Aircraft Maintenance Squadron, marshals out a C-17 Globemaster III here, as it prepares to depart to Joint Base Lewis-McChord, Washington State, in support of Exercise Mobility Guardian July 31. Mobility Guardian is designed to enhance the capabilities of mobility Airmen to succeed in dynamic threat environments. The exercise features more than 3,000 participants and involves 25 countries from July 31 to Aug. 11. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)

JOINT BASE CHARLESTON, S.C. --