Radio Ready Marine Corps Lance Cpl. Zachary Cooper sets up communication during exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 5, 2019. Steel Knight is an annual exercise in which Marines and sailors improve their ability to win a complex, dispersed fight. SHARE IMAGE: Download Image: Full Size (5.36 MB) Tags: training, Marine Corps , Steel Knight Photo By: Marine Corps Cpl. Alexa Hernandez VIRIN: 191205-M-VO343-2004.JPG Photo Gallery