A U.S. Air Force Airman assigned to the 27th Fighter Generation Squadron adjusts the red dot on an M-4 Carbine during a Combat Arms Training and Maintenance course at Joint Base Langley-Eustis, Virginia, May 1, 2024. The red dot can be adjusted to become brighter or lighter, with the ideal setting being the second notch. (U.S. Air Force photo by Airman 1st Class Adisen Smith)