MARINE CORPS AIR STATION YUMA, Ariz. -- U.S. Marines stationed on Marine Corps Air Station (MCAS) Yuma, Ariz., conduct live-fire training qualifications during tables three and four of Combat Marksmanship Coach's Course 3-19 at MCAS Yuma's Range 1 , July 29, 2019. Tables three and four require that Marines shoot targets at unknown distances from supporting firing positions. (U.S. Marine Corps photo by Cpl. Sabrina Candiaflores)