Refining Techniques Marines practice room clearing techniques at Fire Base Gloria, Camp Pendleton, Calif., Jan. 29, 2018. The refined techniques and procedures enhance the ability of Marines to conduct raid operations while deployed. Marine Corps photo by Cpl. Danny Gonzalez SHARE: Download: Full Size (2.15 MB) Credit: Cpl. Danny Gonzalez VIRIN: 180129-M-MR595-1068C.JPG Photo Gallery