Steel Knight Marines participate in training at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 2, 2019, as a part of Steel Knight, an annual exercise in which Marines and sailors improve their ability to win a complex, dispersed fight. SHARE: Download: Full Size (1.25 MB) Tags: training , steel knight 20, marine corps , exercises Credit: Marine Corps Lance Cpl. Benjamin Aulick VIRIN: 191208-M-AB981-1010M.JPG Photo Gallery