UH-60 M Black Hawk helicopters fly in formation before the start of the 2014 Boston Marathon in Hopkinton, Mass., April 21, 2014. The helicopter crews are assigned to the Massachusetts Army National Guard’s 3rd Battalion, 126th Aviation Regiment. UH-60 M Black Hawk helicopters fly in formation before the start of the 2014 Boston Marathon in Hopkinton, Mass., April 21, 2014. The helicopter crews are assigned to the Massachusetts Army National Guard’s 3rd Battalion, 126th Aviation Regiment. SHARE: Download: Full Size (0.48 MB) Tags: Photo Essays Credit: VIRIN: 594214-B-WUV90-410.jpg Photo Gallery