TWENTYNINE PALMS, Calif. (Sept. 27, 2021) Hospital Corpsman Stephen Guinn, assigned to 3rd Battalion, 2d Marine Regiment, 2d Marine Division, attached to 3d Marines, participates in Service Level Training Exercise 1-22 at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Sept. 27, 2021. Range 410A prepares Marines for platoon supported attacks on enemy positions to enhance integrated operations in contested environments. (U.S. Marine Corps photo by Lance Cpl. Ryan Ramsammy)