Abstract: At approximately 8:30 p.m. on June 17, 2021, an employee worked as a shuttle driver. The employee was transporting packages. The employee started work and made multiple pickups, before arriving at the air facility. When the employee arrived, he suddenly began to feel ill. He took a break in the shade, where he drank water and began to vomit. When his symptoms did not improve, he contacted the other shuttle driver for assistance. The other shuttle driver arrived at approximately 7:45 PM and first aid measures were provided. When the Mather facility manager became aware of the illness, he immediately contacted emergency medical services. The employee was hospitalized for heat illness.