https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8741656
U.S. Marines enrolled in the Advanced Infantry Unit Leaders Course simulate breaching a building during a training exercise at Camp Pendleton, Calif., Dec. 13, 2017.
The training is intended for noncommissioned officers and staff noncommissioned officers to gain additional experience in advanced infantry skills, and to increase their levels of responsibility within the infantry battalion. During the 11 weeks of training, the Marines are instructed fire-support planning, combat orders, and company-level offensive and defensive patrolling operations. (U.S. Marine Corps photo by Pfc. Kerstin Roberts) Original public domain image from Flickr
Public DomainFree CC0 image for Personal and Business use