Security Discussion Massachusetts Army and Air National Guardsmen discuss route security procedures before the start of the 121sth Boston Marathon in Hopkinton, Mass., April 17, 2017. Army National Guard photo by Staff Sgt. Evan Lane SHARE: Download: Full Size (1.42 MB) Tags: guard, air force, soldiers, army, airmen Credit: Staff Sgt. Evan Lane VIRIN: 170417-Z-KM772-024A.JPG Photo Gallery