Air transportation specialists assigned to the 621st Contingency Response Squadron prepare to load a C-5 Galaxy May 23, 2021, during exercise Mobility Guardian 2021 at Volk Field Air National Guard Base, Wisconsin. Aerial port Airmen work closely with aircraft loadmasters to carefully position cargo inside aircraft, uploading it onto planes using industrial forklifts or special flat-bed trucks known as K-loaders. (U.S. Air Force photo by Airman 1st Class Matt Porter)